Why do I have breakouts on chest/back and what can I do to treat it?

I recently (last few weeks) had a mild breakout on my chest and back. I also have old marks and reddish/brown bumps on my back and butt from improper shaving/picking at ingrown hairs and razor bumps. I started using amlactin and neutrogena body acne body wash today, and I wanted to know if this was a reasonable routine. None of the bumps are itchy or painful, and I don't have a history of acne or similar skin problems. Thanks!

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