2016年9月27日 · Allergic contact dermatitis is especially common in metal workers, hairdressers, beauticians, health care workers, cleaners, painters, and florists. What causes allergic contact dermatitis? Allergic contact dermatitis is a type 4 or delayed hypersensitivity reaction and occurs 48–72 hours after exposure to the allergen.

Exogenous dermatitis is the result of an external factor or insult that induces skin inflammation. Common causes include: Allergic contact dermatitis — due to immune sensitisation of an individual to an allergen, often at even low concentration, such as nickel, hair dye, rubber, or perfumes; identified by patch testing.

Allergic dermatitis usually occurs unexpectedly after the allergen was previously tolerated. Afterwards, contact with even minute amounts of the allergen cause dermatitis on the exposed sites. The dermatitis may spread beyond the borders of direct contact with the allergen, and may spread more widely (autoeczematisation).

Perioral dermatitis (erythematous papules around the mouth). Contact allergy to the steroid molecule itself or another ingredient. The risk of these side effects depends on the strength of the steroid, the length of application, the site treated, and the nature of the skin problem.

What is allergic contact cheilitis? Allergic contact cheilitis is allergic contact dermatitis affecting the lip(s). It is due to a type IV hypersensitivity reaction following contact with an allergen and usually presents as an eczema-like inflammation of the outer lip or vermilion margin.

Contact allergic dermatitis of the arm and leg images. Created 2007. > Go to the image library. Contact ...

Clinical features of photoallergic contact dermatitis. PACD looks like allergic contact dermatitis. The skin lesions are itchy and confined mainly to sun-exposed skin areas, although sometimes may involve non-exposed sites. With frequent exposure to the allergen, the skin lesions may become lichenified.

2020年4月25日 · Treatments, including emollients, should contain as few allergens as possible, since preservatives are a common cause of allergic contact dermatitis [5,6]. Allergic contact dermatitis has been reported to result in psychological effects in carers as well as in the affected child, inducing anxiety and depression. Therefore, psychological support ...

Dermatitis can be thought of as being exogenous (eg, irritants, allergens, and sometimes light) or endogenous. In practice, dermatitis may be of mixed cause. Patch testing is largely of value in determining the cause of allergic contact dermatitis, and is not useful in …

Subsequently, following extensive domestic use, MI was found to be a strong allergen. It is responsible for an 'epidemic' of contact allergic dermatitis (2016). MI was named Contact Allergen of the Year 2013 by the American Contact Dermatitis Society. Where is …