RT Journal A1 WEBSTER JR T1 DErmatoses which may have an allergic etiologic basis JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1949 FD November 26 VO 141 IS 13 SP 914 OP 917 DO 10.1001/jama.1949.02910130028007 UL http://dx.doi.org/10.1001/jama.1949.02910130028007 AB This presentation is designed not to embody new ideas in cutaneous allergy but rather to give a brief clinical characterization of some of the dermatologic entities that experience has shown not infrequently arise as a result of altered reactivity. To decide whether or not a dermatosis may have an allergic basis, the first step is to make a dermatologic diagnosis if possible, and it is hoped that this presentation may be of help to the nondermatologist in this connection. The diagnosis will indicate whether allergy is a relatively certain, a possible or an unlikely etiologic factor, or need not be considered. It will also suggest the most probable form of allergy, if any, and the type of investigation required from this point of view.In 1940 Sulzberger1 listed a number of dermatoses, grouped as to likelihood of allergic causation as follows:Group 1.—  In many instances proved to be