It begins like Eczema and Psoriasis but as it becomes more aggressive tumours form and finally internal organ infiltration.I wouldn't say Mycosis Fungoides is that slow growing as with me it moved from stage 1a to 2b,the beginning of the aggressive disorder,in about 5 years.I'd also suggest that it's pretty life threatening too as the tumours nearly always implode and become infected.It caused me to have an amputation due to these tumours.Most of the CTCL's do seem to be Mycosis Fungoides but there's a host of them; NK Nasal, Large Anaplastic T Cell,Sezary Syndrome,etc.and all of them should be avoided!!