# COSRX AC Collection Blemish Care Sheet Mask

Blemish-care sheet mask with Tea Tree, Ectoin and Niacinamide.

- Brand: COSRX
- Product: AC Collection Blemish Care Sheet Mask
- Price: $14.99
- Availability: Out of stock
- Made in: Republic of Korea
- Category: Masks

## Key benefits

- Tea tree appears twice on the list, as leaf extract and as leaf oil
- Niacinamide sits in the top five of the list for a more even look
- Ectoin and allantoin comfort stressed, blemish-prone skin
- Arbutin supports a brighter look where marks linger

## How it works

A sheet mask is a fixed dose in a fixed time: the essence stays against the face while the sheet is on, and the step ends when it comes off. This one is soaked in an essence with niacinamide, tea tree leaf extract and tea tree leaf oil, with allantoin and dipotassium glycyrrhizate behind them. It goes after toner, in place of the serum step, in the evening. Blemish-prone skin that looks flushed as well as congested is the case this fits. Two or three evenings a week is enough, because a sheet mask is an addition to a routine rather than the routine itself.

## How to use

1. Use the AC Collection Blemish Care Sheet Mask after toner, in place of your serum step, in the evening.
2. Unfold the sheet, line it up at the eyes first, then smooth it outward so no air is trapped underneath.
3. Take it off at the time printed on the pack, pat in the essence left behind rather than rinsing, then go straight to your moisturizer.
4. Two or three evenings a week is a normal rhythm. Do not leave it on past its time; a sheet that has gone dry takes moisture back off the face as it goes.

## Ingredients

Water, Butylene Glycol, Glycerin, Propanediol, Niacinamide, Melaleuca Alternifolia (Tea Tree) Leaf Extract, 1,2-Hexanediol, Hexylene Glycol, Hydroxyacetophenone, Hydroxyethylcellulose, Arginine, Allantoin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Dipotassium Glycyrrhizate, Xanthan Gum, Disodium EDTA, Polyglyceryl-10 Myristate, Polyglyceryl-10 Laurate, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Caprylic/Capric Triglyceride, Ectoin, Arbutin, Asiaticoside, Dextrin, Asiatic Acid, Madecassic Acid

## FAQ

### Is tea tree oil safe for reactive or acne-prone skin in this format?

Tea tree appears twice on this list, first as Melaleuca Alternifolia Leaf Extract and again lower down as the leaf oil, so the formula carries both a water-soluble and an oil-soluble form. It sits well down the ingredient order rather than near the top, which points to a supporting role rather than a leading one. Anyone sensitive to tea tree specifically should patch test before using a full sheet on the face.

### What does ectoin do on this ingredient list?

Ectoin is an osmolyte, a small molecule that helps cells and the surrounding matrix hold onto water even when skin is under stress from cleansing, weather, or a breakout. It sits mid-list alongside allantoin and dipotassium glycyrrhizate, the formula's calming cluster, rather than near the top where the humectants glycerin and propanediol lead.

### How is centella asiatica represented in this mask beyond the name?

Three named fractions of centella appear near the end of the list: asiaticoside, asiatic acid, and madecassic acid, the same active triterpenes found in standalone cica products. Their position lower in the list means they are present in a supporting rather than headline concentration, working alongside niacinamide and the tea tree pairing rather than carrying the formula alone.

### Can this sheet mask be used on the same night as a retinoid or acid treatment?

The formula itself contains no acid exfoliant or retinoid, so it will not compound with either. Niacinamide, allantoin, and the centella fractions are all commonly layered alongside retinoids and acids in a routine. As with any new sheet mask, patch test first and space it out from an actively irritated night if skin is already reacting to something else in the routine.

### Does this mask leave a sticky or tacky residue after removal?

The base runs on water, butylene glycol, glycerin, and propanediol, three humectants rather than heavy emollients or waxes, so the essence left behind after removing the sheet is thin rather than occlusive. Most users pat the remaining serum in rather than rinsing, and a lightweight residue is expected from this class of ingredient rather than a sign of poor absorption.

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Page: https://korean-pharmacy.com/products/cosrx-ac-collection-blemish-care-sheet-mask