3 doctors weighed in:

What causes a full body rash that looks like flat pink blotches in less than 1 minute, gone in 1 hour without meds. No food or med intake. Not itchy?

3 doctors weighed in
Dr. Michael Fisher
Dermatology

In brief: Urticaria

Urticaria refers to a group of disorders affecting adults and children, in which red patches and weals occur in the skin.
A wheel is a swelling of the surface skin. The skin swelling seen in urticaria is due to the release of chemicals such as histamine from mast cells in the skin which causes small blood vessels to leak. Treatment is with antihistamine or avoidance of the causative agent.

In brief: Urticaria

Urticaria refers to a group of disorders affecting adults and children, in which red patches and weals occur in the skin.
A wheel is a swelling of the surface skin. The skin swelling seen in urticaria is due to the release of chemicals such as histamine from mast cells in the skin which causes small blood vessels to leak. Treatment is with antihistamine or avoidance of the causative agent.
Dr. Michael Fisher
Dr. Michael Fisher
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Dr. Robert Jackson
Dermatology

In brief: Probably

This is probably still a type of hives.

In brief: Probably

This is probably still a type of hives.
Dr. Robert Jackson
Dr. Robert Jackson
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Holly Barth
General Practice

In brief: Depends

Some people get a spotty rash like what you described when they are nervous or flushed.
Others might get the same kind of rash with changes in temperature.

In brief: Depends

Some people get a spotty rash like what you described when they are nervous or flushed.
Others might get the same kind of rash with changes in temperature.
Holly Barth
Holly Barth
Answer assisted by Holly Barth, Medical Student
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