What are the causes of dermatitis

summary

My cousin's feet have been itching recently, and there is a piece of red, sometimes itching even can't sleep, very uncomfortable, the doctor told him that this is a symptom of dermatitis, let me introduce the causes of dermatitis.

What are the causes of dermatitis

First: irritation: as the contact has a direct irritating effect on the skin, any person can react after contact. Its severity is related to the way of contact, and is directly proportional to the chemical nature, concentration and contact time of the contact. Dermatitis can occur within minutes to several hours. Including sunlight, medicine, insect bites, etc.

Second: allergy: such substances have no adverse reactions to most people, but only make a few people with allergic constitution. There is no reaction during the first contact. Generally, the incubation period is 4-20 days. After re contact with similar substances, dermatitis can occur at the contact site or adjacent sites within a few hours to 1-2 days.

Third: neuromodulation: it is generally believed that it is caused by dysfunction of excitation and inhibition of cerebral cortex. Thinking is often due to emotional fluctuations, excessive tension, neurasthenia, etc. Infection: common for fungal and bacterial infection. Others: emotional fluctuations, mental stress, anxiety, sudden changes in living environment can make the disease worse and repeated. Gastrointestinal dysfunction, endocrine system dysfunction, chronic infection and sensitization may also be pathogenic factors.

matters needing attention

There are many causes of dermatitis, including internal factors, such as endocrine disorders, focus infection, and a variety of external factors, such as adverse stimulation, skin allergy, etc.