Could be anything: One could be allergic to anything. This product contains more than just biotin and hyaluronic acid. You could also be sensitive to inert/filler ingredients. And it's possible you have a concidental skin problem unrelated to this product. Stop taking it, and see if your skin condition resolves. Then try again, see if it comes back. But if it's true allergy, you might have worse than just a rash!
Answered 2/23/2018
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