What is contact dermatitis

Contact dermatitis, skin or mucous membrane contact with the outside world and of certain substances after the inflammatory response. Medicine will contact dermatitis is divided into primary and allergic two. Primary contact dermatitis, can occur at any age, any person who, Such patients exposed to a strong acid or alkali substances such strong stimulus, in a very short time and the onset of clinical symptoms arise. If such a person exposed to the weak irritating substances that occur after chronic symptoms. And allergic contact dermatitis, in only a small number of people can cause clinical symptoms, When such patients exposed to the substances caused symptoms soon after in a very short period of time incidence. However, the clinical treatment of the majority of patients with allergic contact dermatitis patients. Can cause contact dermatitis reasons : ① chemical substances, such as metals and their products (nickel, chromium and their products) daily supplies (soap, soap, detergents, leather), plastic products, cosmetics (make-up oil, hair dyed water, Shampoo), the topical drugs (Mercury agent, sulfa drugs, antibiotic ointment, oil cooler) and chemicals (gasoline, kerosene, oil, diesel, paint, various dyes). ② plant material, such as sumac, nettles, pyrethrin, ginkgo, psoralen, Cat grass. ③ animal substances, such as Mylabris, Caterpillar, animals and other toxins. Contact dermatitis only in the vicinity and contact the Department of the disease, skin damage generally the border more clearly, different from contact with objects often have different forms, for example, the strap allergies, often manifested as a circular skin wrist injury. Department onset can occur erythema, papules, Qiu herpes, and so on, obviously itching associated with flu. Patients are often not self-control and constantly ation, the sick were obvious lesions, and even erosion, and a fluid leakage.