Multiple small red bumps appeared on head then back of ear and chest

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small red bumps scalp behind ear chest diagnosis differential

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This is a very characteristic presentation. Here is a thorough breakdown:

Small Red Bumps: Head → Behind Ear → Chest

The pattern you describe - starting on the head/scalp, spreading to behind the ear, then to the chest - is a textbook distribution for several conditions. The most important one to consider first is chickenpox (varicella), but other diagnoses are possible depending on additional features.

Most Likely: Chickenpox (Varicella)

This is the top diagnosis given your symptom pattern.

Why this fits:

Varicella rash classically starts on the face and scalp, then spreads rapidly to the trunk (chest, back), with sparing of the extremities - Fitzpatrick's Dermatology
Lesions begin as rose-colored macules → papules → vesicles (fluid-filled blisters) → pustules → crusts, often progressing over just 12 hours per lesion
A hallmark sign: the early vesicle is surrounded by redness and looks like a "dewdrop on a rose petal"
Lesions in all stages are usually present at the same time - some red bumps, some blisters, some crusting
Behind-the-ear involvement is common as part of the head/scalp spread

Other symptoms to check for:

Low-grade fever, fatigue, headache, loss of appetite (these often precede the rash by 1-3 days in adults)
Itching (often intense)

Contagiousness: Very high - spreads by airborne droplets AND direct contact. A person is contagious from 1-2 days before the rash appears until all lesions have crusted over. - Park's Preventive & Social Medicine

Other Conditions to Consider

Condition	Key Features That Differ from Chickenpox
Seborrheic Dermatitis	Red, scaly/flaky patches on scalp, hairline, and behind ears; extends to chest in some; no blisters; more chronic/recurring; associated with dandruff
Folliculitis	Red bumps centered on hair follicles; may have a small pustule at center; usually no systemic symptoms; common on scalp and chest
Shingles (Herpes Zoster)	Reactivation of the same virus as chickenpox; rash follows a single nerve path (dermatomal) - appears as a stripe, not scattered; burning/pain often precedes rash; more common in older adults or immunocompromised people
Scabies	Intense nighttime itching; tiny burrow tracks; often involves finger webs, wrists, belt line
Contact Dermatitis / Allergic Reaction	Usually confined to area of contact with irritant; may follow use of new shampoo, hair product, or jewelry
Tinea Capitis (Ringworm of scalp)	Fungal infection; scaly patches with hair loss; common in children

When to Seek Medical Attention Promptly

See a doctor soon if:

You are an adult (chickenpox is much more severe in adults than children)
You are pregnant (serious risk to the fetus)
You have a weakened immune system (HIV, cancer, steroids, chemotherapy)
Blisters develop near your eyes
Lesions become very red, warm, painful, or produce thick pus (signs of bacterial superinfection)
You develop difficulty breathing, chest pain, confusion, or stiff neck (rare but serious complications like pneumonia or encephalitis)

What You Can Do Now

Avoid scratching - this reduces risk of scarring and secondary bacterial infection
Antihistamines (like cetirizine or loratadine) can help with itching
Keep skin clean and dry; trim fingernails
Stay isolated from others who have not had chickenpox or the vaccine, especially pregnant women, newborns, and immunocompromised people
If chickenpox is confirmed, antiviral medication (acyclovir) can shorten the illness if started within 24-72 hours of rash onset - a doctor needs to prescribe this

Important note: This information is for general guidance only and is not a substitute for a medical evaluation. Please see a doctor or dermatologist to confirm the diagnosis, especially since the treatment and isolation precautions depend heavily on which condition this is.

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