Lupus is a disease that causes your immune system to attack healthy cells andtissues within your body by mistake. This is a serious disease that can severely damage your skin if left untreated. Skin conditions caused by Lupus usually manifest themselves as large rashes on the back, red patches on the cheeks and face or sores in the mouth or nose. Seeing a dermatologist is critical for alleviating your symptoms and living a more comfortable life.