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What is this unexplained red patch with small blisters on my right thumb?

Posted by mountain

I have a dark red area on the top of my right thumb which just appeared with no apparent cause.  It is a little over 1" square.  It started out looking like a burn.  The next morning it had one small blister on it.  As the day went on, the blisters multiplied.  It doesn't itch, it hurts to touch it.
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