Mycosis fungoides causes

Origins and causes
The cause of mycosis fungoides is unknown, and is not believed to be hereditary or genetic. It is not contagious.

It is rare for the disease to appear before age 20, and it appears to be noticeably more common in males than females, especially over the age of 50, where the incidence of the disease (the risk per person in the population) does increase. The average age of onset is between 45 and 55 years of age for patients with patch and plaque disease only, but is over 60 for patients who present with tumours, erythroderma (red skin) or a leukemic form (the Sézary syndrome).

The disease is an unusual expression of T-cells, a part of the immune system. These T-cells are skin-associated, meaning that they biochemically and biologically are most related to the skin, in a dynamic manner. Mycosis Fungoides is the most common type of 'Cutaneous T cell lymphoma' (CTCL), but there are many other types of CTCL that have nothing to do with Mycosis Fungoides and these disorders are treated differently.