It varies: Mastocytosis in the skin (called urticaria pigmentosa) are reddish-brown "freckles" on the skin that will hive (think of an itchy, red mosquito bite) when scratched or irritated. Mastocytosis throughout the body can present with flushing of the skin, mental "fogginess, " recurrent (often explosive) diarrhea, or even recurrent episodes of anaphylaxis. See a specialist for more information.
Answered 11/20/2018
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