Hmm...need more info: Bruising can mean low platelets and must be checked by your doctor. I am not sure if by knots you mean cysts, blisters, or bumps. Things that come and go within a day are very few, and the most common one is hives, which can look dusky or "bruised": http://www.Dermnetnz.Org/reactions/urticaria.Html i recommend seeing your doctor to help figure out this puzzle.
Answered 4/24/2015
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A doctor has provided 1 answer
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3 doctors weighed in across 2 answers
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