Pimples seem to heal, then come to a head again weeks later. Any experience with this?

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For the past several months I've been having this problem. It looks as though the pimple has begun the healing process, but oftentimes a week later (or multiple times in a few weeks) the pimple will come to a white head again. I've tried hydrocolloid bandages to no avail and I use 2.5% BP to spot treat any huge cystic pimples. I pulled Paula's choice 2% BHA out of my routine until I adjust to the pocketderm but plan to reintroduce it in a month. Is there anything else you can think of? Thanks everyone~!Skin type: normal/dry, moderate hormonal acne on either sides of chin, PIH galoreRoutine:PM: CeraVe Foaming Cleanser-Pocketderm every other night only on chin (4% niacinamide, 4% azaelic acid, 1% clindamycin- used for 2 weeks now and beginning to purge)-Mad Hippie Exfoliating serum (AHA, every 2 days, only used on my forehead)-5% MAP serum (stable vitamin c)-Niacinamide/n-acetyl-glucosamine/allantoin/etc serum-CosRx 96 snail power essence-Paula's choice barrier repair moisturizerAM: water, MAP serum, niacinamide serum, cosrx 96 snail, Kiss my Face spf 40 (10% zinc, 6% titanium dioxide)
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