Discoid Lupus Erythematosus

Discoid lupus erythematosus is a condition in which the immune system mistakenly targets the skin, particularly in areas exposed to sunlight. It most commonly affects the nose and face, causing changes in colour, texture, and the integrity of the skin surface. The condition tends to develop gradually, and many owners first notice crusting, loss of pigment, or a change in the normal smooth appearance of the nose. The visible signs can range from subtle loss of the usual dark colour and texture to more pronounced crusting, scaling, or ulceration. In dogs, the nose is the most frequently affected area, though the condition can occasionally involve the lips, ears, or skin around the eyes. Cats may also develop discoid lupus, though it is seen less often. This page explores the patterns that may appear, what is understood about the immune process underneath, how the condition is typically investigated, and the range of approaches used to manage it over time.