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Hello, this is Dr. David. I am reviewing your question now and will be with you momentarily.
I am sorry you developed this quarter sized blister
could be a new skin infection.
you need to have your doctor do a skin culture to check for skin staph or strep or MRSA skin infection.
your PA should be able to do a skin culture for you.
we don't know why sometimes skin infections occur.
at your age, you can have decreased skin immunity sometimes and develop skin infections.
get a skin culture of the area from your PA
and see if it grows out a skin infection possibly.
take a photo of the area
can you upload a clear jpg photo here so I can better help you?