Abstract
If one should inquire which of the existing medical specialties would profit especially through a deeper knowledge of allergic disease, one would necessarily think first of dermatology. Some may suspect an ironical sense in this statement because of the fact that the sharpest criticism of the common diagnostic procedure used by allergists has come from dermatologists. However, the statement is not so intended, and it is really based on the fact that every recognized category of allergic disease affects the skin. Thus, among the diseases of the skin the familial allergy (hay fever-asthma group) is represented by atopic eczema. This is sometimes proved to be due to allergens of the same type as those causing the other atopic diseases; the second category is epidermal allergy or contact dermatitis, a form of allergic sensitivity that is not familial and affects only the skin; the third form is the cutaneous manifestation of

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