For decades, people with psoriasis have been treated in clinics with narrowband ultraviolet B phototherapy, or light therapy, to reduce sores, scales, and inflammation. Now, new research from the ...

Two patients present with rash eruptions on different parts of the body. Can you correctly identify each case?

Plaque psoriasis, a chronic autoimmune disorder that causes thick, scaly, itchy patches—the eponymous plaques—to form on the skin, affects more than 7.5 million adults in the United States. Yet no two ...