Facial alopecia areata. The effect of PUVA involves local immunosuppression, which allows the hairs to grow back again. The Journal of Investigative Dermatology. Hair often grows back but may fall out again. If the patch of hair loss is expanding, the doctor may pull out a few hairs. Join a support group. Causes Alopecia areata: Symptoms Alopecia areata affects people of all ages including young children. Enregistrez-vous maintenant.