The scalp rash is not uncommon with LUPUS, especially subcutaneous Lupus and/or discoidal lupus. My scalp rash eventually led to hair loss (the hair usually always grows back).
See Lupus Symptoms and Lupus Medications on this forum. I believe that there are some discussions about skin rashes/lesions and treatmetns.
If you need more information...please feel free to ask and I will do all that I can to answer your questions and provide you with some support.
Peace and Blessings