Brownish lesions on: Mastocytosis is when you have collections of mast cells, usually on the skin. These are brown spots, (1 or many) if you scratch them they turn red and swollen for a while (they form a wheal as histamine is released) Usually harmless, but a systemic form exists, not very common, with lesions in bone and other organs.
Answered 12/18/2014
3.7k views
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question