Hello Dr, for the past couple of months i have had a very faint red mark on my penis shaft. It is flat, has never been painful or produced any discharge. It comes and goes, and gets quite dry. I see that masturbating is the thing that irritates it the most and comes back very red soon after. In the past few weeks i have developed more of these marks - 5 or 6 now and all positions on my penis that would be affected to friction marks from masturbation. They are not painful at all, although in the past few days they have become slightly itchy, although this may be down to bad hygiene. Sexual history: i have not had a sexual health checkup in a little over a year, and have had unprotected sex with several women, and these marks came along after one woman in particular. However, after a lot of research it seems i don t fit any of the symptoms for the usual STI s. If anything it seems to be more of a skin condition; my family has a history of serious psoriasis and i see many of my symptoms in conditions such as Bowenoids and dermatisis. Could you give me any advice? Thanks