Medical Definition of Rash

Reviewed on 3/29/2021

Rash: Breaking out (eruption) of the skin. A rash can be caused by an underlying medical condition, hormonal cycles, allergies, or contact with irritating substances. Treatment depends on the underlying cause of the rash. Medically, a rash is referred to as an exanthem.

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Rosacea, Acne, Shingles, Covid-19 Rashes: Common Adult Skin Diseases See Slideshow

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