Pityriasis rosea is a relatively mild skin disorder characterized by a salmon or pink colored, scaly rash. Pityriasis rosea most often affects children and young adults. In many individuals with pityriasis rosea, the characteristic rash develops after vague, nonspecific symptoms that resemble those associated with an upper respiratory infection
7 min read What Is Pityriasis Rosea? Pityriasis rosea, a rash that usually appears on the torso, upper arms, thighs, or neck, may sound worse than it really is. The condition has a name that’sFamily Practitioner. Phototherapy can take the form of exposing the skin to sunlight or to an ultraviolet B light. Either one can help alleviate the symptoms of pityriasis rosea. It reduces itching and heals the rash faster. The ultraviolet B light (or UVB) exposure is done at the doctor's office. rtZT.