Kosi Resurfacing 10% AHA + 2% BHA Mask Treatment

Regular price $58
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Vegan | Cruelty-Free | Silicone & Fragrance-Free | 2% Salicylic Acid

2 fl oz/60 ml



Beta Hydroxy Acids

Alpha Hydroxy Acids


10-minute mask


A mask for weekly skin resets.

This clinically-effective nightly multi-acid resurfacing mask works hard to dramatically improve uneven skin texture, visibly enlarged pores and blemish-prone concerns to reveal soft, healthy-looking skin after every use. With a potent combination 10% AHA Blend, 2% Salicylic Acid, and 8% PHA, Kosi visibly smoothes skin and refines the complexion while balancing skin's barrier for improved clarity, brightness & softness.

- Suitable for all skin types & tones
- Visibly improves the look of uneven skin tone, texture & discolorations
- Minimizes the appearance of enlarged pores
- Helps with blemish-related concerns

Key Ingredients

10% AHA Blend (Lactic, Mandelic & Malic Acids)

Powerful alpha hydroxy acids, these chemical exfoliants have smaller-sized, water-soluble molecules that work on the surface to dissolve buildup and refine uneven texture for improved brightness and clarity. 

2% BHA (Salicylic Acid)

Potent beta hydroxy acid, this oil-soluble chemical exfoliant penetrates pores to help decongest them from excess sebum and buildup that may cause blemishes and an enlarged appearance.

8% PHA (Gluconolactone)

Similar in benefit to AHAs but gentler on sensitive skin types due to its ability to simultaneously hydrate skin as it refines and brightens.

AcquaSeal® Algae

Derived from a green algae that can thrive in extreme environments, this oil-soluble active produces a bioactive complex of lipids and fatty acids that helps renew and hydrate cells to promote cell proliferation and can have anti-inflammatory benefits.

Full Ingredients

Water (Aqua) (Eau), Gluconolactone, Prunus Persica (Peach) Kernel Oil, Lactic Acid, Glycerin, Isoamyl Laurate, Simmondsia Chinensis (Jojoba) Seed Oil, Bentonite, Malic Acid, Cetearyl Olivate, Salicylic Acid, Sorbitan Olivate, Undaria Pinnatifida Cell Culture Extract, Mandelic Acid, Chlamydomonas Reinhardtii Extract, Helianthus Annuus (Sunflower) Seed Oil, Disodium Acetyl Glucosamine Phosphate, Magnesium Chloride, Melia Azadirachta Flower Extract, Curcuma Longa (Turmeric) Root Extract, Ginkgo Biloba Leaf Extract, Avena Sativa (Oat) Kernel Extract, Isoamyl Cocoate, Lysolecithin, Silica, Sclerotium Gum, Potassium Sorbate, Xanthan Gum, Pullulan, Leuconostoc/Radish Root Ferment Filtrate, Sodium Hydroxide

How to use

PM: Apply an even layer to clean, dry skin and leave on for 10-20 minutes. Rinse thoroughly with warm water and follow with Grand Amino Cushion Cream. For best results, use up to twice a week. 

Slight tingling and/or mild redness upon application may be experienced and is normal. If your skin is prone to sensitivity, this mask may not be the right product for you. We suggest a patch test prior to use to check that your skin will tolerate the mask—apply to a small area of skin and wait up to 90 seconds to ensure your skin tolerates the high acid content of this product.

Pore Confession: Do not use other exfoliating products in the same routine. To maintain your refining results, try incorporating Halo AHA + BHA Evening Serum into your nightly routine between uses. 

Warning: For external use only. Use as directed. Avoid contact with eyes.

Sunburn Alert: This product contains an alpha hydroxy acid (AHA) that may increase your skin’s sensitivity to the sun and particularly the possibility of sunburn. Discontinue use immediately if irritation occurs & consult a physician. Use sunscreen daily where AHA has been applied for a week afterwards. Product's contact with skin must be of limited frequency or duration.

Kosi Multi-Acid Mask

Kosi Multi-Acid Mask

Smoother, softer skin with every use, every time. Smoother, softer skin with every use, every time. Smoother, softer skin with every use, every time. Smoother, softer skin with every use, every time. Smoother, softer skin with every use, every time.

Understanding Chemical Exfoliants

AHAs (Alpha Hydroxy Acids) and BHAs (Beta Hydroxy Acids) are chemical exfoliants that can offer significant benefits to the skin when combined in a single product. AHAs, are water-soluble and work on the surface to improve skin texture and tone, while oli-soluble BHAs work deeper within the skin to unclog pores and tackle acne-related concerns. By incorporating both AHAs and BHAs in one formula, you can achieve comprehensive exfoliation and address multiple skin concerns simultaneously. This combination can provide smoother skin, reduced breakouts, improved skin tone, and a brighter-looking complexion.


Percentages Matter

Skin Strategy

Strategic Support

Partner Ingredients

Diglucosyl Gallic Acid

This skin-brightening, naturally anti-inflammatory molecule is activated by your skin’s microbiome, partially transforming it into tri-hydroxybenzoic acid, a natural melanin synthesis inhibitor that can help to even-out and improve overall skin tone.

Wakame Bioferment Advanced

Unique seaweed-derived active found in cultured wakame cells. It can contribute to cell longevity by minimizing cellular damage within the mitochondria, which can help minimize the appearance of premature aging.


Soothing mineral that can help calm visible inflammation in skin, help protect against free radical damage, and is necessary for the enzymes that help to regulate cell turnover and rejuvenation.

Peach Kernel Oil & Jojoba Seed Oil

Cushioning ingredients that form a protective, nourishing buffer to moisturize skin and allow acids to do their job without causing excess irritation or irritability.

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