Red patches at the corners of the mouth may be caused by atopic dermatitis, papular urticaria, eczema, xerostomia, etc. as follows.
1. Allergic dermatitis: It is caused by skin rashes and red patches after contacting allergens, such as contacting pollen, mites, animal fur, or eating foods containing high protein, etc., which may cause similar symptoms, accompanied by redness and itching of the skin.
2. Pemphigus urticaria: It is considered to be pemphigus urticaria caused by mites or mosquito bites, which is also known as insect bite dermatitis in clinic, and is mainly manifested as redness of the skin, red spots, and the red rashes may be fused into one piece or form erythematous plaques.
3. Eczema: related to contact with external factors, long-term stimulation will lead to abnormal skin reactions, such as skin redness, red spots or cause redness, erythema and so on.
4. Keratitis: usually caused by vitamin deficiency or infection, when malnutrition, vitamin B2 deficiency, the body’s iron and protein supply is insufficient, it is often keratitis, the above performance.
Erythema on the corners of the mouth, in addition to the above factors, should also be considered as a result of allergic purpura, dermatophytosis and other diseases, it is recommended that the first observation, such as the condition is serious and lasts for a longer period of time, should be timely consultation.