Nothing scary: This can be a reaction to the various chemicals in your shampoo. Methyl parabens are cited as a trigger in some such products. Your back is the place suds go as you wash. I can't link bacne to any serious disease.
Answered 3/11/2018
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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