A malar rash (), also called butterfly rash, is a medical sign consisting of a characteristic form of facial rash. It is often seen in lupus erythematosus. More rarely, it is also seen in other diseases, such as pellagra, dermatomyositis, and Bloom syndrome.
Many conditions can cause rashes with a similar appearance to a malar rash.
Differential diagnosis
Conditions that can cause rashes with a similar appearance to a malar rash include:
- lupus erythematosus
- pellagra
- dermatomyositis
- Bloom syndrome
- Rosacea, a long-term skin condition characterized by a red rash, usually on the face.
Lupus causes up to 96% of all cases of malar rash.
History
A malar rash is often known more colloquially as a butterfly rash due to its distinctive appearance.