Good morning, for about a year, I've had red marks on the head of the penis with itching and peeling on the shaft. It comes and go. For the past 2 months, I now have itching also around the anus that that gets moist. I've been o the dermatologist 6 months ago and he gave me some ointment to apply ( ketoconazole and hydrocortisone) and told me it might be a slight case of psoriasis. Now with the anus situation, can he be right?