5 doctors weighed in:

What may cause red bumps(rash) like allergy , to come and go away on arms and back? What are the causes?

5 doctors weighed in
Dr. Michael Fisher
Dermatology
3 doctors agree

In brief: Keratosis Pilaris

Keratosis pilaris is a common skin condition in which a protein in the skin called keratin forms hard plugs within hair follicles.
Causes, incidence, and risk factors keratosis pilaris is harmless (benign). It seems to run in families. It is more common in people who have very dry skin, or who have atopic dermatitis (eczema).

In brief: Keratosis Pilaris

Keratosis pilaris is a common skin condition in which a protein in the skin called keratin forms hard plugs within hair follicles.
Causes, incidence, and risk factors keratosis pilaris is harmless (benign). It seems to run in families. It is more common in people who have very dry skin, or who have atopic dermatitis (eczema).
Dr. Michael Fisher
Dr. Michael Fisher
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Dr. Gary Steven
Internal Medicine - Allergy & Immunology

In brief: Sounds like hives

Obviously, the best thing is to see your physician to get evaluated.
In the meantime, otc antihistamines can help with the itching. At your age, the vast majority of cases of hives never get diagnosed, and most often stop coming back in less than six weeks.

In brief: Sounds like hives

Obviously, the best thing is to see your physician to get evaluated.
In the meantime, otc antihistamines can help with the itching. At your age, the vast majority of cases of hives never get diagnosed, and most often stop coming back in less than six weeks.
Dr. Gary Steven
Dr. Gary Steven
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