A cutaneous lymphoma (Latin cutis: skin ) is a lymphoma that occurs in the skin. These primary cutaneous lymphomas must be distinguished from other lymphomas origin ( usually the lymph nodes), which can secondarily infect the skin.
Lymphomas may arise generally from the T- lymphocytes ( T-cell lymphoma) or of the B- lymphocytes ( B -cell lymphomas ). The latter is the case of purely cutaneous lymphoma but rarely the case. Like other cancers also can be malignant ( cancerous ) or benign ( benign ) the cutaneous lymphomas, the latter being but partly also may represent a precursor that can degenerate later on.
The most common malignant cutaneous T -cell lymphoma is mycosis fungoides. The remaining malignant cutaneous T -cell lymphomas can be divided into CD30- positive ( favorable prognosis ) and CD30 -negative ( unfavorable prognosis ).
And B-cell lymphoma can arise primarily in the skin. However, this is rarely the case (eg immunocytoma, germinal center lymphoma Large cell B -cell lymphoma ).
In the benign lymphoma ( pseudo lymphoma), there is the lymphocytoma and Lymphomatoid papulosis.