What is cutaneous t-cell lymphoma exactly?

There is no exactly: These are fairly rare lymphomas that are hard to define and diagnose. What they are not..Are b cell lymphomas which are quite common in comparision. Usually, cutaneous t cell lymphomas are derived from mature t (immune) cells that settle in the skin where they cause rashes, eruptions, itching. They are usually found early and a dermatologist can actually manage them. Late stages are hard to treat.

Type of NHL: Cutaneous t cell lymphoma (ctcl) is a type of non-hodgkin's lymphoma(nhl) , which is a type of cancer of the immune system. Unlike most nhl (which are generally b-cell related), ctcl is caused by a mutation of t cells. The malignant t cells in the body initially migrate to the skin, causing various lesions to appear- reference wikipedia and cancer.Gov. Best wishes.

Mycosisfungoides etc: Cutaneous T cell lymphomas are a group of nonHodgkin lymphomas primarily arising in skin, most common type is Mycosis Fungoides, presenting as plaques and masses and are from clonal T cells and like the second most common CD30 positive lymphomas, are indolent. However aggressive CTCLs also occur, interestingly those viral induced. For detailed reading, see Cualing etal Cutaneous Hematopathology