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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]
The rash appears immediately in irritant contact dermatitis; in allergic contact dermatitis, the rash sometimes does not appear until 24–72 hours after exposure to the allergen. Blisters or wheals: Blisters, wheals (welts), and urticaria (hives) often form in a pattern where skin was directly exposed to the allergen or irritant.
Contact dermatitis is twice as common in females as in males. [11] Allergic contact dermatitis affects about 7% of people at some point in their lives. [12] Irritant contact dermatitis is common, especially among people with certain occupations; exact rates are unclear. [13]
Urushiol-induced contact dermatitis (also called Toxicodendron dermatitis or Rhus dermatitis) is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. [1]
Photodermatitis, sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis in which the allergen must be activated by light to sensitize the allergic response, and to cause a rash or other systemic effects on subsequent exposure.
Substances that come into contact with the skin, such as latex, are also common causes of allergic reactions, known as contact dermatitis or eczema. [28] Skin allergies frequently cause rashes, or swelling and inflammation within the skin, in what is known as a "weal and flare" reaction characteristic of hives and angioedema. [29]
P-Chloro-Meta-Xylenol-induced contact dermatitis; Paraben-induced contact dermatitis; Paraphenylenediamine dermatitis; Permanent wave preparation-induced contact dermatitis; Phenothiazine drug-induced contact dermatitis; Photoallergic contact dermatitis; Photoirritant contact dermatitis; Plant derivative-induced contact dermatitis
Eyelid dermatitis is commonly related to atopic dermatitis or allergic contact dermatitis. [1] Volatile substances, tosylamide, epoxy hardeners, insect sprays , and lemon peel oil may be implicated, with many cases of eyelid contact dermatitis being caused by substances transferred by the hands to the eyelids .