Folliculitis or hyper pigmentation on buttocks? 39 weeks pregnant. What is it and will it go away? (photos)

Instead of getting cellulite or stretch marks my pregnancy has brought on extreme staining and pimples on my butt that leave purple marks. I've been working out regularly but I've done that for years and only had a couple marks here and there. My butt as you see, is covered now. My doctor doesn't think I can do anything now. I'm 39 weeks pregnant. I will ask her for a dermatologist referral. How can I fix this after pregnancy? Laser? Topical treatments? Seems extreme for being hormonal

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