Common causes of redness at the corners of the mouth include seborrheic dermatitis, keratitis, contact dermatitis and other diseases.
1. Seborrheic dermatitis: the etiology of this disease is not clear, may be related to genetic factors, fungal parasites, skin lipids, skin barrier function is impaired, individual susceptibility and other factors, lesions manifested as red patches, covered with greasy scales, may be accompanied by itching and other symptoms.
2. Keratitis: this disease can be caused by fungi, bacteria, viruses and other pathogenic microbial infections, or the corners of the mouth by pulling, impact, friction and other traumatic injuries, or allergies, or nutritional deficiencies and other factors, manifested in the corners of the mouth part of the skin mucous membrane redness, cracking, vesiculation, scabbing, peeling and other symptoms.
3. Contact dermatitis: this disease is mainly caused by contact with some irritating substances, such as detergents, soap, bleach, chemicals, plant leaves and stems, animal toxins and so on. The skin lesions manifest as erythema, papules, scales, cracks and other symptoms.
It is recommended that patients according to their own situation, under the guidance of the doctor to clarify the diagnosis, reasonable treatment.