Thank you for your question.
It does sound like you either had a deeper peel effect or a slight glycolic acid burn; both are normal with glycolic peels and can happen with anyone at any time (yours was the 4th time). Dry skin is usually the cause, and although this happened to you, don't worry. The darkness will take time to resolve and you can do two other things: 1. Wear sunscreen and avoid the sun, and 2. Get a hydroquinone or Triluma prescription to bleach the dark areas.
With time, no matter what it looks like now, it will heal. They always do.
Hope this helps!


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