Recall erythema phenomenon following Er:YAG laser treatment: two case studies and literature review.

Recall erythema is a phenomenon occurring when an area of epidermis treated with laser is later exposed to a trigger, most often sunlight or hot water, causing erythema in the zone of laser treatment after post-treatment erythema has already resolved. Radiation recall dermatitis is a more specific subtype of recall erythema in which an area treated with radiation is subjected to another exposure causing erythema in the area of previous radiation. Cases of recall dermatitis after laser treatment are extremely rare and have only been reported with diode neodymium-doped yttrium aluminum garnet lasers. We report two cases of recall dermatitis following erbium-doped yttrium aluminum garnet resurfacing laser triggered by exposure to either hot water or direct sunlight, and in one case, radioablation of the thyroid gland. We will also provide a brief literature review of recall dermatitis in the setting of laser surgery.