Thin white skin on the inside of the mouth that doesn’t itch can be caused by bad habits, aspergillosis, candidiasis albicans and other reasons. 1. bad habits: often eat spicy stimulating food, eat too hot food, etc. lead to oral mucous membrane damage, may appear in the oral cavity lining off thin white skin, and does not itch the situation. 2. Pemphigus: an autoimmune disease that can form blisters of varying sizes in the oral mucosa, and when the blisters break down, they can cause the inner walls of the mouth to lose thin white skin without pain or itching. 3. Candida albicans: oral infection with Candida albicans can also lead to the oral mucosa covered with white pseudomembrane, diet or stimulation will appear in the oral cavity lining off the thin white skin without pain and itchy situation. It is recommended that patients pay attention to the daily regulation of living habits. If the condition of white skin on the inner wall of the mouth is serious and cannot be relieved, it is necessary to consult a doctor in time for a clear diagnosis and treatment.