Keywords: COVID-19 booster; COVID-19 vaccine; DILAD, drug-induced linear IgA disease; ED, emergency department; LABD, linear IgA bullous dermatosis; Moderna; TEN, toxic epidermal necrolysis; corticosteroids; drug reaction; drug-induced linear IgA disease; linear IgA bullous dermatosis; terbinafine; toxic epidermal necrolysis; toxic epidermal necrolysis-like linear IgA bullous dermatosis.