Evolves in outbreaks, with periods of exacerbation alternating with lower activity. This is not an infectious or contagious disease is not fatal and usually has serious consequences, although in severe cases can have a significant social impact. Although no definitive cure can be controlled with proper care.

It is a rare disease and can occur at any age, but usually it manifests between 15 and 35 years. Its shoots can be sudden or gradual. Sometimes reaches a large area and affects nails, genitals and other body areas, which can have a serious impact on the personality of the victim.