To the Editor.—
This is a supplement to the letter from Lynch and Rudolph, "Indian Sandal Strap Dermatitis" (209:1906, 1969).
Here at Pennsylvania State University we, too, have had our problems with these interesting lesions. At first we believed that they were produced by sensitivity to the leather from water buffalo hides, and we also observed positive patch tests.
We have a large number of graduate students from India, one of whom desribed how these sandals are manufactured by families in their own homes. They use a wide variety of tanning processes, even including animal urine. But the offending ingredient which the authors described as "Indian vegetable tanning" seems to be sumac sap, used in the lacquer.
This is further influenced by the directions which come with some of these sandals, that is, to soak them in water before the initial wearing so that they would mold to some
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