Only used cream once; how to clear subsequent breakout?

So my mom got me Tretanoin cream. I had NO idea how powerful this stuff was and was definitely not intending to use it long-term. But I put WAY too much on my face, and I've since had a horrible breakout on either side of my chin for almost a month! I've been using Benzoyl Peroxide but it's just not working. I do not want to use the cream again, but the breakout won't go away! What should I do?

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