Linear immunoglobulin A (IgA) bullous dermatosis (LAD) in a Hispanic female patient. This is a rare autoimmune disease that leads to blistering of the skin. It is caused by the immune system attacking the proteins that hold skin cells together at the junction between the epidermis and dermis. LAD is characterised by a linear band of IgA molecules at this junction. In most cases the cause is not know, but in some cases it is drug-induced. Treatment involves corticosteroids or immunosuppressants.