What concentration AHA should I be using?

Hello Randy!

This might be more of a dermatology question but I was hoping you could help me anyway.
What type of Alpha Hydroxy Acid is best for post-inflammatory hyper-pigmentation (I have brown spots left over from my acne marks): glycolic acid, lactic acid, malic acid, tartaric acid, mandelic acid, or citric acid? What concentration of AHA do I need for it to be effective? Are there any other considerations (e.g. pH of the solution, applying wet or dry, oxidation, etc.)?

I’ve been currently using Garnier Clinical Overnight Dark Spot Peel daily at night. I’ve noticed a slight difference in my skin texture, but it’s no miracle in a jar. I haven’t really seen an improvement of my blotchiness. Does this product even have enough Glycolic Acid?

Ingredients: Aqua / Water, Alcohol Denat, Hydroxyethylpiperazine Ethane Sulfonic
Acid, Propylene Glycol, Glycerin, Glycolic Acid, Sodium Hydroxide, Algae
/ Algae Extract, Ascorbyl Glucoside, Benzyl Alcohol, Benzyl Salicylate,
Biosaccharide Gum-1, Hydroxyethylcellulose, Limonene, Linalool, Peg-40
Hydrogenated Castor Oil, PPG-26-Buteth-26, Parfum / Fragrance.

I want to switch from a daily overnight peel to a weekly peel (I’d rather be using Retinol at night, and it’s awkward to layer both of them given the texture of this Garnier Peel). I assume if I’m using a peel less frequently I should be using a higher concentration? What concentration is best for weekly peels?