Were you keeping them in pretty moist conditions? I have seen similar things with snakes kept to wet (blisters). Keep them a little drier (provide a water bowl) and add some heat (try to get a small hot spot around 90F). Make sure they still have access to cooler temps (65-75).
Just my 2 cents,
-Chris
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Christopher E. Smith
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Captive Bred Herps
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