Cutaneous T-Cell Lymphoma (CTCL) is a rare form of skin cancer. It most often develops over many years and is caused by T-Cells in the skin growing in an uncontrolled way. There are a wide range of symptoms including rash-like patches in the earliest stages and then lumps and swollen lymph nodes evolve later. The causes of CTCL are unknown and like other cancers, it is not infectious.