Do I Have Epidermal or Dermal Hyperpigmentation from Vi Peel?

I received a Vi Peel a little more than 2 weeks ago, and small spots of what I think is PIH appeared on my upper lip and side of my cheekbone by my eye (I have chinese skin that rarely burns).  My questions is, how do I know if it is epidermal or dermal hyperpigmentation? I know dermal hyperpigmentation is much harder to treat, and was wondering what my options would be for both? I have applied 2% hydroquoinone to the spots for the past 4 days but have not seen improvement.

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