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What can cause water blisters on my armpit?

Posted by Lacettijean

I went to bed one night and woke up with a deep burning on my armpit. I examied my arm and found a broken water blister. I immediately cleaned the area and wrapped it up. I got another blister on my armpit. They burn terribly and hydrogen peroxide even burns when I use it to clean the area with. Could this be a heat rash from sleeping in heat? Or could this be serious?
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