The cause of mastocytosis is uncertain, although genetic mutations are known to be involved. A genetic mutation occurs when the normal instructions that are carried in certain genes become ‘scrambled’.
Mastocytosis in the skin have the symptoms as: red and itchy rash, hives, rash that looks like freckles, or a lump on your skin. Diarrhea and stomach pain are the symptoms there for Mastocytosis in the stomach.
Mastocytosis is a disorder characterized by mast cell proliferation and accumulation within various organs, most commonly the skin. Mast cells are located in connective tissue, including the skin, the linings of the stomach and intestine.