By eHow Health Editor
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Mast cells are good cells, which protect against infection. They're found in the skin, stomach, intestine and cartilage. Sometimes, for an unknown reason, there is an excess of mast cells. This condition is known as mastocytosis. The most common form of mastocytosis is the cutaneous form, which is an excess of mast cells in the skin. Systemic mastocytosis comes from an excess of mast cells in tissues of the spleen, liver, bone marrow and small intestine.