Pigmentbio C-Concentrate – Brightening Pigmentation corrector Cream for Dark Spots. Contains vitamin C, AHA, and BHA. Pigmentbio C-Concentrate is the Best cure for reducing Dark Spots, Pigmentation & suitable for Sensitive Skin. Helps reduce Dark Spots. Apply 5 drops every evening to face and neck for a period of 1 month. Avoid the eye contour area. Avoid prolonged sun exposure while using the product.