Has anyone checked your vitamin C levels? Also, Prednisone can interfere with absorption or processing of the nutrition that is needed for healthy skin (sulfur, essential fatty acids, etc.), and so you may need to supplement with MSM, fish oil (which may help the Lupus too), and a good daily multi-vitamin/mineral supplement, if you aren't doing so already, and if you are not allergic to fish, sulfur, or the ingredients in the multivitamin/mineral supplement. Alternatives to fish oil include grass fed organic beef, flaxseed oil (only use raw, not safe when heated or cooked!), and certain nut & seed oils.
Also, have you seen a Naturopathic or Homeopathic Physician? There are some amazing things that can be achieved through alternative methods (positive personal experience, and also observed positive experiences in close family members).
Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, Very Low Lymphocyte Counts (T-Cells & B-Cells), malabsorption/malnutrition, possible Lyme Disease (Igenex Lab IgM WesternBlot positive), etc.
Meds: Pulmicort, MaxAir, Injectable Vitamin B12, Herbs, Nutritional Supplements, Essential Oils, Homeopathy.