There are actually four types of lupus: systemic lupus erythematosus, discoid lupus erythematosus, drug-induced lupus erythematosus and neonatal lupus.
Lupus can affect so many different organs it can be difficult to diagnosis because the symptoms can be so varied. Some cases of lupus are slow and progressive while others are sudden.
Systemic lupus erythematosus (SLE) is the most common type that is expressed in patients. SLE affects several different organs in the body, such as the skin, kidneys, brain, blood, hearts or lungs.
Discoid lupus erythematosus, also called cutaneous lupus, affects only the skin and no other organ systems. The rash, which is circular in nature, is usually limited to the face, neck and scalp of the body.
Drug-induced lupus erythematosus is induced in a patient by taking certain medications. There is a genetic predisposition in the patient because not all people taking that medication suffer from lupus.
https://www.empowher.com/lupus/content/learning-more-about-lupus