Doctor has to look: Rashes are difficult to describe in words. A primary care doctor or a dermatologist can examine a pigmented patch to see what it might be. Sometimes rashes are related to allergies, irritants, eczema, fungi (tinea), psoriasis, etc..., but other times they are not. For odd rashes, skin biopsy may be done by a dermatologist, which also looks for skin cancer.
Answered 12/9/2013
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