Penile psoriasis is the worst thing you can get on your love noodle next to herpes. The first line of attack is usually a topical treatment using a cream such as hydrocortisone. Genitals: Psoriasis of the vulva often appears as a smooth, non-scaly redness. Scratching this area may cause an infection, create dryness, and result in thickening of the skin and further itching. Due to the sensitivity of genital skin, treatment requires some special consideration. Psoriasis on penis and treatment. The skin is so sensitive, especially the glans and just underneath it, I cannot wear loose fitting boxers because it rubs against it which causes the skin to get irritated.