Skin rashes due to allergies belong mainly to the allergic reactions of the so-called delayed type (type IV), the allergic contact eczema. In their appearance they belong to the group of eczema. This is a non-infectious, itchy inflammatory reaction of the skin.
This can take the form of allergic contact eczema, caused by direct contact with an allergenic substance, but it can also be triggered by repeated small doses of the substance in question. On the other hand, the skin can also react to an allergenic load absorbed through the lungs or the gastrointestinal tract. Even independent dermatological clinical pictures, such as neurodermatitis or psoriasis, are influenced by allergic stress.
In the further one it concerns however above all the skin rash by allergy, in the sense of the allergic contact eczema. Not every allergy sufferer reacts to the causative foreign substance in a different way. While a slightly pronounced allergy typically only leads to the development of a skin rash, pronounced allergic reactions can also manifest themselves as life-threatening situations.
In this context one speaks of a so-called anaphylactic reaction. In addition to the skin rash typical of an allergy, affected persons often also suffer from an impairment of the upper respiratory tract. Already a short time after the contact with the allergen, the nose of the affected person begins to run.
In addition, the upper respiratory tract can become narrow due to an allergy-related swelling of the mucous membranes. Acute inflammation of the conjunctiva with watery and itchy eyes is not uncommon in allergies. Depending on the extent of the allergic reaction, the gastrointestinal tract can also be affected.
For this reason, in addition to the typical skin rash, some allergy sufferers suffer from diarrhoea and nausea. In addition, general symptoms such as fever, fatigue, exhaustion and sleep disorders can be observed particularly frequently. The allergic skin rash must also be divided into different classes.
As the largest organ of the body, the skin represents the outer protective mantle. In addition, the skin surface has a certain signal function, because changes in the skin area can be traced back to internal processes. Particularly with regard to contact with non-infectious foreign substances (allergens), the skin plays a decisive role as a helper and messenger of the body’s own immune system.
A skin rash that develops in the course of an allergy can therefore be limited to a specific region (local rash) or affect a larger area of skin. In addition, rashes caused by an allergic reaction can take on different colors. Depending on the causative foreign substance and individual immune reaction, the rash may be reddish to brownish in color. Skin rashes are often located near the intimate area.
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