Summary
The distinction between the various types of contact dermatitis is based on a number of factors. The morphology of the tissues, the histology, and immunologic findings are all used in diagnosis of the form of the condition. However, as suggested previously, there is some confusion in the distinction of the different forms of contact dermatitis. Using histology on its own is insufficient, as these findings have been acknowledged not to distinguish, and even positive patch testing does not rule out the existence of an irritant form of dermatitis as well as an immunological one. It is important to remember, therefore, that the distinction between the types of contact dermatitis is often blurred, with, for example, certain immunological mechanisms also being involved in a case of irritant contact dermatitis.
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