Contact dermatitis is the skin or mucous membrane contact with an exogenous substance, in contact with the site of acute or chronic inflammatory reaction, contact dermatitis hazards are as follows: 1, one of the main symptoms of contact dermatitis is burning sensation and itching, patients often can not control the desire to scratch, often irritable, nervous and anxious, serious and even insomnia, seriously affect daily life, work and the patient’s For the disease itself repeated exposure to allergic substances or improper treatment, acute contact dermatitis can be transformed into subacute or chronic dermatitis, the rash is maroon moss-like changes or eczema-like changes, increasing the difficulty of treatment, but also affect the aesthetics. Therefore, if contact dermatitis occurs, you should go to the hospital in a timely manner, under the guidance of the doctor to use the correct medication, shorten the course of the disease, to minimize the harm.