Linear IgA bullous dermatosis is a chronic, acquired, autoimmune subepidermal vesiculobullous disease. Both children and adults are affected. It is characterized by direct immunofluorescence findings of linear immunoglobulins class A (IgA) deposits along the dermal-epidermal junction (basement membrane zone). In children, the disease is commonly referred to as chronic bullous disease of childhood and it mostly affects children between 2 and 5 years. The onset of the disease is acute; the first episode is the most severe, while recurrences tend to wax and wane in severity and last till puberty or even longer. Diaminodiphenylsulfone is the treatment of choice, although systemic corticosteroids are reported to be very effective as well. We report a 3-year-old boy with a vesiculobullous eruption which developed one week following administration of cephalexin for upper respiratory infection. He was referred to our Clinic from other health institutions as treatment failure for suspected