There are multiple recognized forms of lupus: Systemic lupus erythematosus (SLE) is the disease most commonly mentioned, and the most serious since it involves the entire body. Discoid lupus is a skin-only illness in which a specific rash, mostly a scarring rash of circular-shaped lesions, occurs without other symptoms (SLE patients sometimes have the same rash). Subacute cutaneous lupus involves a more widespread rash that is often worsened by sun exposure. It is associated with a limited form of SLE in about 50% of cases. Drug-induced lupus is relatively rare and is triggered by certain medications, such as hydralazine and some anti-seizure medications. Drug-induced lupus causes joint pain in about 90% of cases, rash in 20%, and inflammation of the lining of the heart or lung in 15%. It typically goes away if the drug is stopped. Neonatal lupus occurs in infants whose mothers have specific blood test findings, but not in infants of mothers who have SLE but do not have these blood test findings. Its symptoms usually consist mainly of a transient, unimportant rash and blood test findings that disappear within a few months. In rare cases, it can lead to a serious form of heart disease.