What causes perioral dermatitis?

Perioral dermatitis refers to inflammatory lesions of the skin around the lips. The main causes of this lesion include: first, mite infection causes inflammatory lesions of perioral dermatitis, which normally show small papules or hillock blisters. Second, long-term use of glucocorticoid ointments, or cosmetics containing glucocorticoids, will cause perioral dermatitis. Third, is in the fertile period of women, if the occurrence of perioral dermatitis, but also consider the possibility of taking contraceptives for a long time to cause this disease. Fourth, brushing teeth when using toothpaste containing too much fluoride, may also cause perioral dermatitis. Fifth, allergic reactions may be caused by this symptom of another cause.