Hello, I have this severe hyperpigmentation on my face for the past 4 months. Any suggestions? (photos)

Especially around the mouth. A blackish/grayish discoloration. It probably happened soon after i used a herbal thing on my face, for exfoliation. I have tried aloe vera, Vit C serum. It just wont disappear. My dermatologist labelled it as post inflammatory hyperpigmentation. And advised IPL so I have had two sessions of it so far. But i dont see any improvement yet. Not even an inch of it. I am so upset and embarrassed cause of it. I dont know what to do. Much thanks. Please help me out.

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