Jul 24, - Learn about genital psoriasis, its causes, symptoms, diagnosis, and is a type of the skin condition psoriasis that you get on or around your genitals. between your thighs and groin; Anus and crease between buttocks. Aug 23, - Penis: Psoriasis of the penis takes the shape of many small, red patches on the shaft. The skin may appear scaly or be smooth and shiny. This condition can occur in all males, whether they are circumcised or not. Anus and surrounding area: Psoriasis on or near the anus is red, non-scaly, and likely to itch.