Concurrence of alopecia areata and vitiligo at the same anatomical site.

Both alopecia areata and vitiligo are common skin disorders that are considered to be caused by an autoimmune response targeted to hair follicle and melanocyte antigens, respectively. The association of these two diseases in the same patient is well known, however, coexistence of alopecia areata and vitiligo within the same lesion is very rare. Herein, we report an 8-year-old boy who had colocalization of alopecia areata and vitiligo on the frontal portion of his scalp.

Polymorphic eruption of pregnancy with palmoplantar involvement that developed after delivery.

Polymorphic eruption of pregnancy is the most common specific dermatosis of pregnancy. It usually develops in the third trimester and rapidly resolves in the first weeks postpartum. Intensely pruritic urticarial papules and plaques initially occur on the abdomen and/or proximal thighs, particularly within or adjacent to striae distensae with periumbilical sparing, and usually tend to spread to affect the peripheral limbs, buttocks, chest and back.