Started with a mask allergy, the skin was itchy and irritated, and white patches appeared. Lips also became crusty and itchy. Consulted many doctors, and tried various medicines and topical treatments (ointments and lotions). The itching is completely gone, but the white patches (looks like discoloration) are still there, apparently spreading to other regions. Please help me find the cause, as no doctors we visited could actually help. Attaching photo for reference. This condition is affecting her mentally also. Generally has dry skin and oily scalp.