What's the difference between the mandelic 12% compared to the pha topical acid. which one works best to help with hyperpigmentation?

Mandelic acid is mainly for acne and clearing out pores. For hyperpigmentation, try a combo product with kojic acid, licorice root, azelaic acid and niacinamide.

can i use this on my neck?

Yes, but approach with caution. Neck skin is very thin compared to face and chest skin.

After I shave my head, I am left with darker areas where my hair would grow. Will this help with lightening or removing said area?

I would suggest getting something specifically for your head. I can only comment on how the results left my face since that is what it is intended for.

ASIN	B086Z73PQT
Active Ingredients	grape fruit
Best Sellers Rank	#20,849 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #488 in Facial Serums
Brand Name	Naturium
Customer Reviews	4.5 out of 5 stars 844 Reviews
Item Form	liquid
Item Height	5.4 inches
Item Volume	1 Fluid Ounces
Item Weight	1 Ounces
Manufacturer	Naturium
Material Features	Natural
Material Type Free	Paraben Free
Number of Items	1
Product Benefits	All, Exfoliating
Recommended Uses For Product	Collagen Production
Scent Name	Unscented
Skin Tone	All
Skin Type	Combination, Dry, Normal, Oily, Sensitive
Special Ingredients	Collagen, alpha_hydroxy
Target Use Body Part	Whole Body
UPC	850010792217
Unit Count	1.0 Fluid Ounces

Mandelic Topical Acid 12%

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