Definition A contact allergy is an allergy of the so-called late type. Here, after a previous asymptomatic contact with the substance that triggers the allergy, repeated contact causes a symptomatic reaction. There are both genetic and non-genetic factors that favour the occurrence of a contact allergy. The most common contact allergens are nickel and cosmetics. … Contact allergy
Diagnosis The diagnosis of a contact allergy includes various common tests of allergy diagnostics. The most important test for the diagnosis of a late type contact allergy is the epicutaneous test. In this test, potential allergens are incorporated in vaseline in a very high dilution and applied to the back of the affected person. The … Diagnosis | Contact allergy
Duration A contact allergy usually subsides within several days if the triggering allergen is avoided. The healing process is accelerated by consistent medical treatment with cortisone ointments and moist compresses. However, if the allergen is not avoided, contact allergies can lead to persistent eczema, which can last for weeks or even months. A contact allergy … Duration | Contact allergy
Allergy types Nettles lead to itchy wheals on contact with the skin, which are often misinterpreted as an allergy. This is not an allergy, but a kind of toxic reaction of the skin to the stinging hairs of stinging nettles. However, the stinging nettle can also lead to allergies caused by its pollen. As an … Allergy types | Contact allergy
