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Allergic contact dermatitis (ACD) is a form of contact dermatitis that is the manifestation of an allergic response caused by contact with a substance; the other type being irritant contact dermatitis (ICD). Although less common than ICD, ACD is accepted to be the most prevalent form of immunotoxicity found in humans. [1]
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.
Rash, sneezing, congestion, wheezing, vomiting from coughing, Sometimes itchy welts. Caused by dander, saliva or urine of dogs, or by dust, pollen or other allergens that have been carried on the fur. [76] Allergy to dogs is present in as much as 10 percent of the population. [76] Insect sting: Hives, wheezing, possible anaphylaxis
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.
Allopurinol hypersensitivity syndrome (AHS) typically occurs in persons with preexisting kidney failure. [3]: 119 Weeks to months after allopurinol is begun, the patient develops a morbilliform eruption [3]: 119 or, less commonly, develops one of the far more serious and potentially lethal severe cutaneous adverse reactions viz., the DRESS syndrome, Stevens Johnson syndrome, or toxic epidermal ...
[2]: 118 The rash may also be one of the potentially lethal severe cutaneous adverse reactions, the DRESS syndrome, Stevens–Johnson syndrome, or toxic epidermal necrolysis. [ 3 ] [ 4 ] Systemic manifestations occur at the time of skin manifestations and include a high number of eosinophils in the blood , liver inflammation , and interstitial ...
Livedo reticularis is a common skin finding consisting of a mottled reticulated vascular pattern that appears as a lace-like purplish discoloration of the skin. [1] The discoloration is caused by reduction in blood flow through the arterioles that supply the cutaneous capillaries, resulting in deoxygenated blood showing as blue discoloration ().
The diagnosis is frequently made by treating the initial triggering skin problem and observing the improvement in the eczematous rash. Both the initial skin problem and the id reaction must be observed to make the diagnosis. [5] [6] Not all dyshidrotic rashes are id reactions, but id reactions are often dyshidrotic-like. [2]