Rashes in children are caused by viral infections, bacterial infections, allergic reactions, eczema, fungal infections, heat, irritants, or inherited skin conditions. The skin is the body's largest organ and reacts to many different triggers, making rashes one of the most common reasons parents seek medical advice.
The skin is an incredibly responsive organ that can react to internal changes (like infections or immune responses) as well as external factors (like irritants, allergens, or temperature). This means rashes can have many different causes, and understanding these helps parents know what to expect and when to worry.
Rashes are particularly common during a child's first year of life. The developing immune system, sensitive newborn skin, and frequent exposure to new substances all contribute to the prevalence of skin changes in infants. While this can be alarming for new parents, most of these rashes are completely normal and resolve without intervention.
The same type of rash can look quite different from one child to another, or even different on the same child at different times. Factors like skin tone, the stage of the rash, the child's temperature, and recent activities all influence appearance. This variability can make identification challenging, which is why understanding the general patterns and key warning signs is more important than trying to match a rash exactly to a description.
Childhood skin conditions generally fall into several main categories, each with distinct characteristics and management approaches:
Seek medical care if your child has a rash with fever and appears unwell, if the rash spreads rapidly, if it doesn't fade when pressed (petechial rash), if there are signs of infection, or if your child has difficulty breathing. Most rashes don't require medical attention, but knowing the warning signs is crucial.
One of the biggest challenges for parents is knowing when a rash is simply part of normal childhood and when it requires medical attention. The general rule is that how your child feels overall is more important than how the rash looks. A child who is playful, eating normally, and seems well is unlikely to have a serious condition, even if the rash looks concerning.
However, certain features of a rash or accompanying symptoms should prompt immediate medical evaluation. Understanding these warning signs can help you make confident decisions about when to seek care and when to manage symptoms at home.
A non-blanching (petechial) rash with fever can indicate meningitis or sepsis - call emergency services immediately. Find your emergency number →
The glass test is a simple but potentially life-saving check that every parent should know. Press a clear drinking glass firmly against the rash. If the rash fades or disappears under pressure and returns when you lift the glass, this is called a "blanching" rash and is usually not serious. If the rash stays visible through the glass and doesn't fade, this is a "non-blanching" or "petechial" rash, which can indicate bleeding under the skin and requires immediate medical attention, especially if accompanied by fever.
Common infectious rashes include chickenpox (itchy blisters), fifth disease (slapped cheek appearance), roseola (rash after fever), hand-foot-mouth disease (blisters on hands, feet, mouth), measles (spreading red rash), scarlet fever (sandpaper-textured rash), and impetigo (honey-colored crusts). Most viral rashes resolve without treatment in 3-7 days.
Infectious rashes are among the most common skin conditions in childhood. They occur when the body's immune system responds to viral or bacterial infections, often producing characteristic patterns that can help with identification. Understanding these common infectious rashes helps parents know what to expect during the course of illness and when complications might be developing.
Chickenpox is a highly contagious viral infection that causes an itchy, blistering rash. While much less common since vaccination became widespread, cases still occur. The rash typically starts on the trunk and spreads to the face, arms, and legs, including the scalp and sometimes inside the mouth.
Red bumps that develop into fluid-filled blisters, then crust over
Bumps may appear the same color as surrounding skin or slightly red; texture changes are more noticeable than color
Timeline: New spots appear for 3-5 days, with bumps, blisters, and crusts visible simultaneously. Complete healing takes 1-2 weeks.
Associated symptoms: Fever, tiredness, headache, reduced appetite
When to seek care: If blisters become infected (increasing redness, pus), if your child has high fever or is very unwell, or if there are blisters near the eyes. Always call before visiting a clinic as chickenpox is highly contagious.
Fifth disease, caused by parvovirus B19, is known for its distinctive "slapped cheek" appearance. By the time the rash appears, the child is no longer contagious. The condition is generally mild in healthy children but can be concerning during pregnancy.
Bright red rash on both cheeks (slapped cheek appearance), followed by lacy, net-like rash on arms, legs, and trunk
May appear as a darker or reddish-purple discoloration on cheeks; the lacy pattern may be less visible but texture can be felt
Timeline: Cheek rash lasts a few days; body rash may come and go for weeks, especially after warm baths, exercise, or sun exposure
Associated symptoms: Mild fever, runny nose, and tiredness before the rash appears; joint pain in older children
When to seek care: Most children don't need medical care. Seek advice if your child has sickle cell disease or other blood disorders, or if a pregnant woman has been exposed.
Roseola is a common viral infection in children aged 6 months to 2 years. It's characterized by several days of high fever followed by a rash that appears as the fever breaks - a pattern that can be reassuring once you know to expect it.
Small pink or light red spots, starting on trunk and spreading to limbs and face
Spots may be subtle or barely visible; texture changes may be more apparent than color changes
Timeline: High fever for 3-5 days, then rash appears as fever breaks and lasts 1-3 days
Associated symptoms: High fever (often 39-40°C/102-104°F), irritability, mild diarrhea, swollen eyelids
When to seek care: Seek care for fever lasting more than 3 days, if your child has a febrile seizure, or if they seem very unwell. The rash itself doesn't require treatment.
This common childhood infection causes painful sores in the mouth and a rash on hands and feet. It's most common in children under 5 and spreads easily in childcare settings. Despite the uncomfortable symptoms, it's usually mild and resolves on its own.
Painful blisters and sores on tongue, gums, inside of cheeks, and back of throat
Flat or raised spots with blisters, sometimes extending to buttocks and legs. On darker skin, spots may appear darker brown or grayish rather than red.
Timeline: Symptoms last 7-10 days; mouth sores typically most painful for first few days
Associated symptoms: Fever, sore throat, reduced appetite due to mouth pain, drooling in young children
When to seek care: If your child won't drink fluids, has high fever, or symptoms worsen after the first few days.
Measles is a highly contagious viral infection that has become rare in countries with high vaccination rates but remains a significant concern globally. It causes a distinctive rash along with respiratory symptoms and can lead to serious complications.
Flat red or reddish-brown spots that start behind ears and on forehead, spreading downward. Spots often merge together.
May appear as darker brown, purple, or dusky patches. The merging pattern is still visible.
Timeline: Rash appears 3-5 days after first symptoms, spreads over 3 days, then fades in the same order it appeared
Associated symptoms: High fever, cough, runny nose, red watery eyes, white spots inside mouth (Koplik spots) before rash
When to seek care: Always contact a healthcare provider if you suspect measles, but call first rather than visiting in person due to high contagiousness. Measles can have serious complications.
Scarlet fever is caused by group A streptococcus bacteria, the same bacteria that causes strep throat. It produces a distinctive sandpaper-textured rash and requires antibiotic treatment. Early treatment prevents complications and reduces contagiousness.
Fine, rough-textured rash that looks like sunburn with tiny bumps. Starts in armpits and groin, spreads to trunk and limbs. May be more intense in skin folds.
Texture change (sandpaper feel) may be more noticeable than color. Some redness may be visible, or skin may appear slightly darker.
"Strawberry tongue" - white coating followed by bright red, bumpy tongue. Flushed cheeks with pale area around mouth.
Timeline: Rash appears 1-2 days after illness starts, lasts about a week, then skin may peel (especially fingertips)
Associated symptoms: Sore throat, fever, headache, swollen lymph nodes in neck
When to seek care: Contact a healthcare provider if you suspect scarlet fever. Antibiotic treatment is needed to prevent complications.
Impetigo is a highly contagious bacterial skin infection common in young children. It typically appears around the nose and mouth but can occur anywhere on the body. It spreads easily through direct contact and shared items.
Starts as small red spots or pimples that develop into blisters. Blisters burst and form characteristic honey-colored or golden crusts. The infected area may spread outward or appear in new locations.
Timeline: Without treatment, can persist for weeks. With treatment, healing begins within 24-48 hours and clears in 7-10 days.
Associated symptoms: Usually no fever or general illness. May be mildly itchy or sore.
When to seek care: See a healthcare provider for diagnosis and treatment. Prescription antibiotic cream or oral antibiotics speed healing and reduce spread. Keep children home from school/daycare until sores have dried.
Eczema (atopic dermatitis) appears as dry, itchy, rough patches of skin that can become red, inflamed, and cracked. In babies, it commonly affects cheeks and scalp. In older children, it typically appears in arm and knee creases, hands, and around the eyes. On darker skin, eczema may appear darker brown, purple, or grayish rather than red.
Eczema is the most common chronic skin condition in children, affecting 15-20% of children worldwide. It typically begins in infancy or early childhood and, while many children outgrow it, some continue to have symptoms into adulthood. Understanding eczema helps parents manage symptoms effectively and know when flare-ups need medical attention.
The hallmark of eczema is the "itch-scratch cycle" - the skin itches, the child scratches, and scratching damages the skin barrier, leading to more inflammation and more itching. Breaking this cycle through proper moisturizing, trigger avoidance, and appropriate treatment is the key to management.
Dry, rough, scaly patches that appear pink or red during flare-ups. May have small bumps. Skin may weep or crust when severely inflamed.
Patches may appear darker brown, purple, or grayish. Redness may not be visible, but texture changes (roughness, scaliness, small bumps) are apparent. May appear ashy or lighter than surrounding skin when dry.
Common locations by age:
Key features: Intense itching (often worse at night), dry skin, recurring pattern in typical locations, family history of allergies or asthma common
Management:
When to seek care: If the eczema is severely affecting your child's sleep or daily life, if there are signs of skin infection (oozing, crusting, increased pain, spreading redness), or if over-the-counter treatments aren't helping.
Hives (urticaria) are raised, itchy welts that appear suddenly, often moving around the body. They're commonly triggered by viral infections, allergies, medications, or unknown causes. Individual welts last less than 24 hours but new ones may appear. Most cases resolve within days, but seek emergency care for hives with breathing difficulty or facial swelling.
Hives are one of the most alarming rashes for parents because they appear suddenly and can look dramatic. However, in most cases, hives in children are triggered by common viral infections rather than dangerous allergies. Understanding when hives are part of a serious allergic reaction versus a normal response to infection helps parents respond appropriately.
Raised, red or pink welts of varying sizes, often with pale centers. May form large patches when welts merge.
Raised welts may appear lighter than surrounding skin, or the same color with visible texture change. May have a slightly purple or brownish tint.
Individual welts typically last less than 24 hours, but new welts appear in different locations - they seem to "move around" the body.
Common triggers in children:
Treatment: Antihistamines are the main treatment. Cool compresses may help relieve itching. Most cases resolve within days to weeks.
These signs indicate anaphylaxis, a severe allergic reaction requiring immediate treatment. Find your emergency number →
Common birthmarks include stork bites (pink patches on eyelids, forehead, neck), hemangiomas (raised red "strawberry" marks), port-wine stains (flat purple-red marks), and Mongolian spots (blue-gray patches common in babies with darker skin). Most birthmarks are harmless, though some require monitoring or treatment.
Birthmarks are extremely common, with around 80% of babies having at least one type. They form from abnormal clusters of blood vessels (vascular birthmarks) or pigment cells (pigmented birthmarks). While most are completely harmless and many fade over time, some types benefit from early evaluation and treatment.
These are the most common type of birthmark, present in up to 50% of newborns. They consist of tiny blood vessels visible through thin newborn skin.
Flat pink or red patches, most common on eyelids, forehead (between eyebrows), and back of neck
May appear as red or purple patches, sometimes subtle and may be less visible
Outlook: Marks on the face typically fade by age 1-2 years. Marks on the back of the neck ("stork bite") often persist into adulthood but are usually covered by hair.
Treatment: None needed. Completely harmless.
Hemangiomas are benign tumors made of blood vessels. They're not usually present at birth but appear within the first few weeks of life, grow during the first year, then gradually shrink and fade over several years.
Raised, bright red, bumpy surface (like a strawberry). Deeper hemangiomas may appear blue or purple.
May appear darker red, purple, or blue. Surface texture is similar.
Timeline: Appear by 6 weeks of age, grow for 6-12 months, then slowly shrink over years. Most are gone or significantly faded by age 5-10.
When to seek care: Consult a doctor if hemangiomas are near the eyes, nose, mouth, or in the diaper area; if your baby has multiple hemangiomas (6 or more); or if they appear to be growing rapidly or ulcerating. Some may need treatment to prevent complications.
Port-wine stains are permanent birthmarks caused by abnormal capillaries in the skin. Unlike stork bites, they don't fade on their own and may darken over time.
Flat, pink to deep purple patches. May darken to deep red or purple over time and develop a thickened, bumpy texture in adulthood.
May appear dark red, purple, or very dark brown
Location: Can occur anywhere but commonly on the face. May occur on one side only.
Treatment: Laser treatment can lighten port-wine stains and is most effective when started early in life. Facial port-wine stains, especially around the eye, should be evaluated by a specialist as they can be associated with other conditions.
These are flat, blue-gray patches most commonly seen in babies with Asian, African, Hispanic, or Native American heritage, though they can occur in babies of any ethnicity. They're caused by pigment cells in deeper layers of skin.
Flat, blue-gray or blue-black patches, often resembling bruises. Most commonly found on the lower back and buttocks, but can appear elsewhere.
Outlook: Gradually fade and usually disappear by school age, though some may persist. Completely harmless.
Important note: These can sometimes be mistaken for bruises. If there's any question about whether marks are bruises or birthmarks, a healthcare provider can help distinguish them.
Other common childhood skin conditions include ringworm (circular fungal infection), molluscum (small pearly bumps), warts, keratosis pilaris (rough bumps on arms), heat rash (prickly heat), and cradle cap. Most are harmless and either resolve on their own or respond well to simple treatments.
Despite its name, ringworm is a fungal infection, not a worm. It's common in children and spreads through direct contact with infected people, animals, or contaminated objects.
Round or oval patches with raised, red, scaly edges and clearer centers (ring shape). May be itchy.
Patches may appear brown, dark brown, or gray. The ring pattern with raised edges and clearer center remains characteristic.
Treatment: Antifungal cream from pharmacy usually clears it within 2-4 weeks. See a doctor if it's on the scalp (may need oral treatment), if it's not improving with treatment, or if it's widespread.
Molluscum are small, painless skin growths caused by a virus. They're common in children and spread through skin contact. While harmless, they can persist for months or even years.
Small (2-5mm), dome-shaped bumps with a characteristic dimple or pit in the center. May be skin-colored, pink, or pearly white. On darker skin, may appear slightly lighter than surrounding skin.
Location: Commonly on trunk, arms, face, and armpits. Can occur anywhere except palms and soles.
Outlook: Each bump typically lasts 2-3 months before resolving, but new bumps may continue to appear. Complete resolution takes 12-18 months on average, sometimes longer.
Treatment: Usually no treatment needed as they resolve on their own. Children can continue normal activities including swimming.
Heat rash occurs when sweat becomes trapped in the skin, common in hot weather or when babies are overdressed. It's very common in infants whose sweat glands are still developing.
Small bumps or blisters, often in clusters. On lighter skin, appears as small red or pink bumps. On darker skin, bumps may be less visible but texture is noticeable.
Location: Typically in areas where sweat collects - neck, chest, back, armpits, groin, skin folds
Treatment: Cool the skin - remove excess clothing, move to cooler environment, use cool (not cold) compresses. Usually resolves within hours to a day once skin is cooled.
Keratosis pilaris causes rough, bumpy skin often described as "chicken skin." It's extremely common and harmless, caused by a buildup of keratin around hair follicles.
Small, rough bumps that may be skin-colored, pink, or red
Bumps may appear darker than surrounding skin or have a slightly lighter appearance
Location: Most common on upper arms and thighs; can also appear on cheeks (especially in children)
Treatment: No treatment necessary. Moisturizing and gentle exfoliation may improve appearance. Often improves with age.
Normal newborn skin changes include erythema toxicum (red blotchy rash with yellow centers), milia (tiny white bumps on face), baby acne (small pimples), and newborn peeling. These are extremely common in the first weeks of life and resolve without treatment. Skin changes are part of the normal transition from womb to outside world.
Newborn skin goes through many changes in the first weeks of life as it adapts from the protected environment of the womb to the outside world. These changes can be alarming for new parents but are almost always completely normal and temporary.
Despite its alarming name, this is a completely harmless and very common newborn rash, occurring in up to 50% of newborns. The cause is unknown.
Blotchy red areas with small yellow or white bumps in the center, resembling insect bites or small pimples. On darker skin, the red blotchiness may be less visible, but the yellow-white bumps are apparent.
Location: Primarily on chest, back, face, and limbs. Spares palms and soles.
Timeline: Appears between days 1-4 of life, comes and goes, completely resolves within 1-2 weeks
Treatment: None needed. Despite its appearance, it doesn't itch or cause discomfort.
Milia are tiny cysts containing keratin (skin protein) that appear as small white or yellow bumps on newborns' faces.
Tiny (1-2mm) pearly white or yellow bumps, like small seeds
Location: Most common on nose, cheeks, chin, and forehead
Timeline: Present at birth or appear within first few weeks; resolve on their own within weeks to months
Treatment: None needed. Don't squeeze or pick at them. They'll resolve naturally.
This article is based on current medical research and international guidelines. All claims are supported by scientific evidence from peer-reviewed sources.
Evidence grading: This article uses the GRADE framework (Grading of Recommendations Assessment, Development and Evaluation) for evidence-based medicine. Content is regularly reviewed against current guidelines and updated research.
Teething itself is not considered a direct cause of a true body-wide rash, but drooling during teething can irritate the skin around the mouth, chin, cheeks, and neck. This is often called drool rash or irritant contact dermatitis. It may appear as redness, small bumps, chapping, or rough patches where saliva stays on the skin. Clinicians usually distinguish this from infection or allergy by its location, relation to moisture, and absence of systemic symptoms.
Contagious rashes are often suspected when a child has fever, respiratory symptoms, diarrhea, known exposure at school or daycare, or several similar cases in close contacts. Viral rashes may spread with coughs, sneezes, stool, or skin contact, depending on the infection. Some bacterial and parasitic conditions, such as impetigo or scabies, can also spread through close contact. The appearance alone is often not enough; clinicians usually consider timing, symptoms, exposure history, and local outbreak patterns.
Rashes that change quickly over minutes or hours are often related to temporary inflammation in the skin, such as urticaria, heat-related flushing, irritation, or pressure marks from clothing. Temperature, sweating, bathing, crying, exercise, and scratching can make some rashes look brighter for a short time. Other rashes, such as many viral exanthems or eczema flares, usually persist longer and evolve over days. Tracking triggers and taking dated photos can help show the pattern clearly.
Last reviewed: · Reviewed by iMedic Medical Editorial Team