Baby Rash Types With Pictures: Pediatrician’s Visual Identification Guide (2026)

Medically reviewed by Dr. Sarah Williams, MD — Board-Certified Pediatrician

Most baby rashes fall into one of about 14 common categories, and they can be reliably identified by combining four features: your baby’s age when it appeared, whether the rash is flat or raised, where it’s located on the body, and what other symptoms are present (fever, itching, feeding changes, respiratory symptoms). This visual guide walks through each rash type with the pediatric decision criteria we use in clinic to distinguish harmless newborn skin changes from rashes that need urgent care.

Because photos can never replace an in-person exam — lighting, camera color, and skin tone all shift how a rash appears — use this guide to narrow possibilities and recognize red flags, not to make a final diagnosis.

The 4-Question Decision Framework

Before identifying a specific rash, answer these:

1. How old is your baby? Certain rashes only appear at certain ages. Erythema toxicum only in the newborn period; eczema rarely before 2 months; teething rash only after 4 months.

2. Flat, raised, or fluid-filled? Flat (macule) — pink or red spots you can’t feel. Raised bumps (papule) — small firm bumps. Fluid-filled (vesicle/pustule) — clear or yellow-white blisters.

3. Where on the body? Face only? Diaper area? Trunk? Whole body? Palms and soles?

4. Any other symptoms? Fever, feeding refusal, breathing difficulty, lethargy, or fussiness change the urgency dramatically.

Age-Based Rash Guide

The 14 Most Common Baby Rashes

1. Erythema Toxicum Neonatorum

Age: Day 2–5. Look: Irregular red patches with tiny yellow-white pustule in center — “flea bites” on red background. Location: Face, trunk, arms, thighs — never palms/soles. Action: None — resolves in 7–14 days. See our erythema toxicum guide.

2. Baby Acne

Age: 2–6 weeks. Look: Small red bumps, occasional whiteheads, no scaling. Location: Cheeks, forehead, nose. Action: Wash gently with plain water. Don’t use acne products. Resolves by 3–4 months.

3. Milia

Age: First few weeks. Look: Tiny pearly-white bumps, 1–2 mm across. Location: Nose, chin, cheeks. Action: Never squeeze. Resolves in 2–4 weeks.

4. Cradle Cap (Seborrheic Dermatitis)

Age: 2 weeks – 6 months. Look: Yellow, greasy scales. Location: Scalp; may extend to eyebrows, behind ears, chest. Action: Soften with baby oil, gentle brushing, mild shampoo. See cradle cap guide.

5. Eczema (Atopic Dermatitis)

Age: 2 months and up. Look: Dry, red, rough, scaly patches — very itchy. Location: Cheeks, forehead, outer arms, backs of knees. Action: Fragrance-free thick moisturizer 2–3× daily, short lukewarm baths, mild topical steroid when flaring.

6. Heat Rash (Miliaria)

Age: Any. Look: Pinpoint pink bumps or tiny clear blisters. Location: Warm covered areas. Action: Cool the environment, light cotton, no creams. Resolves in 2–3 days.

7. Diaper Rash — Irritant

Look: Pink, mildly red, fuzzy borders; spares deep skin folds. Action: Frequent changes, air time, zinc oxide barrier cream.

8. Diaper Rash — Yeast

Look: Beefy red, sharp borders, satellite spots, involves the folds. Action: Antifungal cream 7–10 days. See yeast diaper rash guide.

9. Drool Rash / Contact Rash

Age: 3 months+. Look: Pink, sometimes chapped patches around mouth/chin/neck. Action: Wipe drool, thin barrier of petroleum jelly.

10. Hives (Urticaria) — Allergic

Look: Raised pink welts with pale centers, blanch with pressure, individual spots move over hours. Action: Remove trigger. Call 911 for lip/face swelling or breathing difficulty. See allergic rash guide.

11. Slapped Cheek (Fifth Disease / Parvovirus B19)

Age: 6 months – school age. Look: Bright red flushed cheeks; lacy rash on trunk/arms days later. Action: Supportive care. See doctor if under 6 months, immunocompromised, or pregnant mother exposed.

12. Roseola (Sixth Disease)

Age: 6–24 months. Look: High fever 3–5 days that breaks, then pink flat rash on trunk. Action: Fever management, hydration.

13. Hand-Foot-Mouth Disease (HFMD)

Age: 6 months – 5 years. Look: Small red spots with central blister on palms, soles, mouth. Action: Cool fluids, acetaminophen, no daycare until fever-free 24 hours.

14. Petechiae (Purple Spots) — EMERGENCY

Look: Tiny pinpoint dark red or purple spots that don’t blanch when pressed. Action: Emergency room now, especially with fever.

🚨 Red Flags — Call 911 or Go to the ER Immediately

• Swelling of lips, tongue, face, or around eyes
• Difficulty breathing, wheezing, or noisy breathing
• Pale, gray, or blue skin
• Sudden floppiness or unresponsiveness
• Purple or dark red spots that don’t blanch with pressure
• Repeated vomiting with new rash
• Fever over 100.4°F rectal in a baby under 3 months
• Fever over 102°F with rash in any child
• Rapidly spreading redness with warm, swollen skin

When to Call Your Pediatrician (Same Day)

• Rash present at birth
• Rash lasting more than 2 weeks
• Painful rash
• Any rash after starting a new medication
• Rash with feeding refusal or unusual sleepiness
• Blisters larger than pinpoint size
• Any rash in a baby under 6 weeks you’re unsure about

The Glass Tumbler Test (Blanching Test)

This 30-second test helps distinguish benign from serious rash. Press the side of a clear glass against the rash. Blanches (fades) with pressure → most likely benign inflammatory rash. Does not blanch → petechiae or purpura — seek urgent evaluation. Non-blanching spots with fever is a medical emergency.

What to Photograph for Your Pediatrician

• Well-lit natural light, no flash
• Close-up and wide shot of affected area
• Ruler or coin for scale
• Timeline: when it started, how it has changed
• Associated symptoms: fever, feeding, sleep changes

Related ChildBloom Guides

• Yeast Diaper Rash: Identification & Treatment
• Red Blotches on Infant Face: 10 Causes
• When to Worry About a Rash on Your Child
• Newborn Allergic Rash: Emergency Signs
• CMPI Rash in Breastfed Babies
• Baby Cradle Cap Guide
• How Long Baby Acne Lasts

Frequently Asked Questions

How can I tell if my baby’s rash is serious?

Use the glass tumbler test: if the rash blanches when you press a clear glass against it, it’s most likely benign. If spots stay visible (don’t blanch), they may be petechiae — seek urgent evaluation, especially with fever. Any rash with breathing difficulty, lip/face swelling, purple non-blanching spots, or high fever is an emergency. This FAQ is educational and not a substitute for pediatric evaluation.

What does eczema look like on a baby?

Eczema appears as dry, rough, scaly, red patches that are very itchy — babies often rub their face against bedding. It typically starts on the cheeks and forehead between 2–4 months, then can involve the outer arms, backs of knees, and inner elbows.

Can I identify my baby’s rash from a photo online?

Photos help narrow possibilities but can’t replace an in-person exam. Lighting, camera color balance, and skin tone all change how a rash appears. Use images to recognize red-flag features but confirm with your pediatrician.

What’s the difference between heat rash and eczema?

Heat rash: tiny pinpoint bumps in warm covered areas, resolves in 1–3 days. Eczema: dry, rough, scaly red patches, very itchy, typically on cheeks or outer arms, chronic.

Why do rashes look different on different skin tones?

On darker skin tones, redness may appear as deeper purple, gray, brown, or dark red. Focus on texture, pattern, and feel rather than color alone.

My baby has a rash and a fever — should I worry?

Rash plus fever always deserves same-day pediatrician contact. It’s a medical emergency if the child is under 3 months, has non-blanching purple spots, difficulty breathing, unusual sleepiness, or temperature above 102°F.

How long should a baby rash last?

Erythema toxicum 7–14 days; baby acne 3–4 months; heat rash 1–3 days with cooling; eczema chronic with flares; roseola 1–3 days; HFMD 5–10 days. Any rash lasting more than 2 weeks should be evaluated.

Should I put anything on my baby’s rash before seeing a doctor?

Less is more. Applying random creams often masks the rash and can worsen it. Keep skin clean with lukewarm water, apply fragrance-free moisturizer if dry, and photograph the rash.

Can teething cause a rash?

Yes — the drool rash is a real irritant reaction to constant saliva around the mouth, chin, and neck folds beginning around 4–6 months. Treat with gentle wiping and a thin barrier of petroleum jelly.

What rash means my baby has an allergy?

True allergic rashes are typically hives — raised pink welts with pale centers that blanch under pressure and move around the body over hours. Onset is within minutes to 2 hours of exposure. Widespread hives with lip/face swelling or breathing changes is a 911 emergency.

References

• AAP HealthyChildren.org — Skin Conditions in Newborns and Infants.
• Cleveland Clinic. Baby Rashes: Types, Symptoms & Treatment.
• NIH PMC — Common Neonatal Skin Conditions: A Practical Approach.
• Nelson Textbook of Pediatrics, 21st edition.
• Fitzpatrick’s Dermatology in General Medicine, 9th edition.

About the author: Dr. Sarah Williams, MD is a board-certified pediatrician. Learn more at /about/.

Medically reviewed July 2026.

Related Rash Guides from ChildBloom

Once you’ve narrowed the rash type, go deeper with a targeted guide:

• Red Blotches on Infant’s Face — 10 causes of facial redness, from newborn acne to allergic reactions.
• Yeast Diaper Rash — beefy-red rash with satellite spots that won’t clear with barrier cream.
• Bleeding Diaper Rash — raw, open diaper rash and the ACT (Air-Cleanse-Thick barrier) protocol.
• Cradle Cap on Face & Eyebrows — yellow, greasy scales beyond the scalp — oil-and-brush technique.
• Mongolian Spots vs Bruise — 3-test rule (Time, Color, Touch) to tell birthmarks from bruises.
• When to Worry About a Rash — red-flag chart: fever, spreading, purple spots, or breathing changes.

All guides reviewed by pediatricians on the ChildBloom clinical team. When in doubt, contact your child’s doctor.

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