Contact: Many itchy skin problem are caused by a contact allergy to agent but then there are many other causes which cannot be distinguished from a contact allergy which is usually detected by doing a patch test read at 48-72 hrs after the application. Atopic dermatitis is a totally different condition with an impaired skin barrier being the primary defect.
Answered 9/29/2016
4.8k views
Allergen: An allergy regardless of its location (internally or externally) is caused by an allergen... Something that causes the allergic response.
Answered 10/5/2013
4.8k views
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