Drug eruptions are frequently encountered and they represent "diseases of medical progress". They are expected in about 2% of treated patients. Their putative diagnosis is based on a set of imputability factors. Several distinct drug-induced skin disorders are identified. They are initially recognized from personal experience, but the implication to a specific drug derives from the collective experience of published evidence. Their histopathological aspect is often evocative or demonstrative for the nature of the dermatosis. Some drug eruptions follow an indolent course, while others are life-threatening.