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