...Impetigo is an inflammatory disease of the skin, characterized by theformation of distinct pustules, about the size of a pea or a bean, withoutitching... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...A dermal ridge from posterior edge of eyelid to rump; anotherridge extends posteromedially from the eyelid; scattered pustules on thedorsum in some specimens...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...The back is rough having low, scarcely elevated pustules, butbecomes less rough anteriorly and most of the top of head is smooth...
Robert G. Webb 「A New Species of Frog (Genus Tomodactylus) from Western Mexico」
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