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Contact dermatitis is a type of acute or chronic inflammation of the skin caused by exposure to chemical or physical agents. [1] Symptoms of contact dermatitis can include itchy or dry skin, a red rash, bumps, blisters, or swelling. These rashes are not contagious or life-threatening, but can be very uncomfortable.
A clinical diagnosis of dermatitis will always come from your primary care doctor or dermatologist, she says. ... Contact dermatitis occurs when your skin is exposed to a substance that irritates ...
Other symptoms to note: Contact dermatitis appears following exposure to an irritant or allergen, and it’s the most common rash caused by external factors, Dr. Zeichner says. (This can include ...
The symptoms of allergic contact dermatitis are very similar to the ones caused by irritant contact dermatitis, which makes the first even harder to diagnose. The first sign of allergic contact dermatitis is the presence of the rash or skin lesion at the site of exposure. [2]
A patch test relies on the principle of a type IV hypersensitivity reaction.. The first step in becoming allergic is sensitization. When skin is exposed to an allergen, the antigen-presenting cells (APCs) – also known as Langerhans cell or Dermal Dendritic Cell – phagocytize the substance, break it down to smaller components and present them on their surface bound major histocompatibility ...
[17] [18] Symptoms of this type of dermatitis may be very intense and may come and go. Irritant contact dermatitis is usually more painful than itchy. Although the symptoms of atopic dermatitis vary from person to person, the most common symptoms are dry, itchy, red skin, on light skin.
Stasis dermatitis, allergic contact dermatitis, acute irritant contact eczema and infective dermatitis have been documented as possible triggers, but the exact cause and mechanism is not fully understood. [7] Several other types of id reactions exist including erythema nodosum, erythema multiforme, Sweet's syndrome and urticaria. [3]
Physical irritant contact dermatitis is a less-researched form of irritant contact dermatitis [3] due to its various mechanisms of action and a lack of a test for its diagnosis. Patch test. A complete patient history combined with negative allergic patch testing is usually necessary to reach a correct diagnosis. [4]