My 14 year old daughter had skin peeling off the roof of her mouth.... It was light pink. She has been on plaquinil and methatrexate for 3 months?

If your daughter has. Lupus & Sjogren's Syndrome, peeling of the mucous membranes of her hard palate can either be from her auto-immune disorders or from her Plaquinil & Methotrexate. If she has Rheumatoid Arthritis, it's probably from her meds. Ask her rheumatologist to refer her to a dentist who has expertise in oral manifestations of chronic systemic diseases. She should avoid spicy or acidic foods till treated. .