Alopecia areata is a chronic condition of hair follicles and nails with unknown etiology, which causes hair loss. It emerges in several clinical types, with the diffuse form, where there is acute and diffuse hair loss, being atypical. It is generally accepted that there is a T-cell mediated, organ-specific autoimmune base in alopecia areata and studies indicate that the autoantigen is associated with melanocytes. The authors of the present paper report the case of a patient who had the diffuse form of alopecia areata, with preservation of the gray hair strands

Keywords: Alopecia Areata; Alopecia; Autoantigens; Hair

One of the resources available aimed at improving skin quality are chemical peels, that can include the use of several active substances. Superficial peels reach the epidermis only and usually cause a slight desquamation for cell renewal, however they are not free of complications. The authors present a report of a patient who had contact dermatitis linked to retinoic acid, after undergoing a combined peeling procedure with Jessner's solution followed by 5% retinoic acid.

Keywords: Chemexfoliation; Receptors, retinoic acid; Skin aging