SLE is systemic lupus erythematosus...and it comes in two varieties. One is discoid...skin only. The other form is systemic and can be far more serious than discoid.

google 'discoid sle pictures' and you can get a better idea.
There is a great deal of variation. My friend's daughter gets really red/purple arm rashes if exposed to sun for any length of time. She's under treatment for it - - it's another autoimmune - so no cure...but she has had good remission periods.