In medicine, malar rash (from Latin mala ‘jaw, cheek-bone’), also called butterfly rash, is a medical sign consisting of a characteristic form of facial rash. It is often seen in Lupus erythematosus but is not pathognomonic - it is also seen in other diseases such as Pellagra, dermatomyositis and Bloom Syndrome. The malar rash of lupus is red or purplish and mildly scaly. Characteristically, it has the shape of a butterfly and involves the bridge of the nose. Notably, the rash spares the naso-labial folds of the face, which contributes to its characteristic appearance...