and photochemotherapy. Traditionally these are difficult to apply to the scalp or areas covered by hair. Existing treatments can clear but do not cure the affected areas. While repeated...

, such as the hands or elbows, where psoriasis is often localized. Some are sold with a comb-type attachment designed to separate the hair and deliver light to the exposed psoriatic... scalp. Interviews with doctors and patients indicate that these devices are neither efficient nor easy to use. The treatment is inconsistent and time-consuming. Hair blocks light...