'''Mastocytoma''' (MAS-toh-sy-TOH-muh) is a growth or [[lump]] of mast [[cell]]s (a type of [[white blood cell)]]. Mast cell tumors can involve the [[skin]], subcutaneous tissue, and muscle tissue. Also called mast cell [[tumor]].
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'''Mastocytoma''' (MAS-toh-sy-TOH-muh) is a growth or [[lump]] of mast [[cell]]s (a type of [[white blood cell)]. Mast cell tumors can involve the [[skin]], subcutaneous tissue, and muscle tissue. Also called mast cell [[tumor]].