Psoriasis treatments are increasingly being studied in specific parts of the body, giving health care practitioners evidence-based help in selecting a particular treatment for a particular patient. For example, the effectiveness of certain treatments on psoriasis of the scalp, hands, feet, nails, and/or genital area have been specifically documented in clinical studies. Doctors also gather anecdotal evidence on these and related issues. If your number one goal of treatment is to clear a particular area or areas of your body, be sure to tell your doctor.