Can anyone diagnose this?

I am working on a case study homework assignment for my anatomy and physiology class and need to diagnose these symptoms of an 18 year old woman. Here is what I am working with: "child's physician advises against prolonged exposure to the sun without high SPF sun tanning lotion. After age 14, the child no longer listens to the Doctor's orders and begins sun tanning outside and making frequent use of tanning beds. At the age of 18 the child (now a young woman) notices an odd butterfly mark upon her face. She also complains of painful joints and mouth ulcers. The young woman is also a very low weight." Any help would be amazing.