Pimples on forehead & pain in upper back????

I'm 3 1/2 mths post-op. Have lost 75 lbs. Am noticing dozens of tiny bumps or pimples on my forehead. Don't know if related to surgery, vitamins or what. Am taking all my vitamins every day. Also am experiencing pain in upper back. Don't know if related or just weak muscles. Anyone have any ideas?

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