Flat topped
polygonal,shiny,
Violaceous and slightly scaly,found chifely on the flexor surfaces.
The mucous membranes are commonly invoved.Iching of the skin is usual and may be quite severe.
Cause is unknown some times Hepatitis C is positive with this problem.
Men and women are equally affected
Adults are most commonly affected,although no age after 10 is excempt.
Psychological upsets often precede an attack.
Trauma: a scratch or more serious injury sometimes produces the first lesion.