| http://www.w3.org/ns/prov#value | - The most common cutaneous (skin) form is also called urticaria pigmentosa (UP), which occurs when mast cells infiltrate the skin.The solitary from is a single lesion known as a mastocytoma.Systemic mastocytosis is caused by the accumulation of mast cells in the tissues and can affect organs such as the liver, spleen, bone marrow, and small intestine.Urticaria pigmentosa was first described in 1869
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