How and why does dermatitis occur

Instruction
Simple forms of dermatitis occur under the influence of various aggressive substances on the skin. If the cause of the disease is a slight mechanical, thermal or radiation exposure, the natural protective system of the skin does not allow the disease to develop, and the inflammation quickly passes. But with intense and prolonged contact with irritating factors, dermatitis can turn into an acute or chronic form, in which it is difficult to treat.
Dermatitis can be caused by a wide variety of physical, chemical and biological stimuli. The most common of them are household chemicals, cosmetics, pharmaceuticals and potent toxic substances, such as insecticides. Depending on the type of the active substance, dermatitis can manifest itself in different ways: from slight reddening of the skin to deep lesions, including ulcers.
Certain types of the disease can develop against the background of serious disruptions in the functioning of the body systems. For example, seborrheic dermatitis occurs as a result of a combination of two factors: low immunity and hormonal disorders, which lead to changes in the chemical composition of sebum. In addition, there are infectious and fungal dermatitis that develops due to the ingestion of harmful microorganisms to the skin surface (streptococci, staphylococci, and fungal pathogens).
Allergic dermatitis is the result of the body's response to substances to which it has an increased sensitivity. This type of disease develops under the influence of a variety of allergens: food, plant pollen, dust, animal hair, drugs. The number of allergens is enormous, therefore, it is often possible to establish the cause of allergic dermatitis only with the help of complex diagnostic studies, such as skin allergy tests. The main cause of this disease is genetic predisposition.
The degree of severity of dermatitis depends on the type of exposure, its duration and intensity, as well as on the area of ​​the affected surface.If the cause of the disease is known, and its symptoms are mild, special treatment may not be necessary - it is enough to eliminate the irritating factor. But for severe skin lesions, such as severe inflammation, redness and itching, medical intervention is necessary, because without timely treatment, skin damage can become severe.