COSRX
AC Collection Blemish Care Sheet Mask
A single-use sheet mask for blemish-prone skin, carrying tea tree leaf extract and oil alongside ectoin, arbutin and niacinamide, left on for fifteen to twenty minutes before removal.
No reviews yet- Ships from our California warehouse
- Duties prepaid
- Suited to
- DryDehydratedSensitiveCompromised barrier
- Helps with
- DehydrationBarrier weaknessBreakouts and congestionUneven tone and dullness
Sold out.
Tell us where to send it
One email, the moment this exact unit is back in stock. Not a newsletter and not a sequence, and your address comes off the list the second it is sent.
- Duties prepaid
- 30-day returns
- Free US shipping on orders of $100 or more
- Dispatched within 2 business days
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.
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
Key actives
Melaleuca Alternifolia (Tea Tree) Leaf Extract
the classic clarifying botanical for blemish-prone skin
Ectoin
a stress-shielding hydrator that comforts reactive skin
Niacinamide
supports a more even, clearer look
Arbutin
brightening support where post-blemish marks sit
COSRX AC Collection Blemish Care Sheet Mask
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.
- Ships from
- California
Duties are prepaid. Nothing is owed at delivery. Returns are accepted for 30 days, by mail.
Orders ship from our California warehouse, dispatched within 2 business days, and arrive in 3 to 5 days. Shipping is free on orders of $100 or more.
We split shipments free, so one out-of-stock item never holds up the rest of your order.
Where this unit came from
- 1Seoul
Bought as Korean-market stock - 2Customs
Duty paid by us before it enters the US - 3California
Ships domestically, no international leg
We stock the version of a formula that is sold in Korea, not the release a brand prepares for another market under the same name.
Every unit keeps its original barcode and batch code intact, so the unit in your hands can be checked against the brand’s own records.
Import duties are paid by us before the parcel reaches you, so nothing is owed at the door, and returns run for 30 days.
Every claim on this page traces to the unit in the box, the barcode, the batch code and the price you can read for yourself.
Payment and security
We accept
How to use
- Use the AC Collection Blemish Care Sheet Mask after toner, in place of your serum step, in the evening.
- Unfold the sheet, line it up at the eyes first, then smooth it outward so no air is trapped underneath.
- 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.
- 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.
Reviews
No reviews yet. Tell us how much you love the product!
Write Reviews (opens in a new tab)COSRX, Korean-market original
Blemish-care sheet mask with Tea Tree, Ectoin and Niacinamide.
Verify your unit when it arrives
Verify your unit when it arrives
Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.
COSRX verifies units itself. Find the verification page on cosrx.com and enter the batch number and expiration date printed on your unit. Read them off the package rather than from us, which is the point.
Source: COSRX FAQ
On the unit itself
- The Korean-market barcode, unaltered from the retail package.
- The manufacturer’s batch code, exactly as the maker printed it.
정품Genuine article, Korean-market stock
What professionals say
What professionals say
What skin-care professionals say about the key actives in this formula, quoted from the medical sources linked beside each.
Arbutin works to inhibit tyrosinase, an enzyme present in melanocytes, the pigment-producing cells in the skin. This results in less pigment, dark spots and skin lightening.
Tiffany Jow Libby, MDBoard-certified dermatologist, mindbodygreen I think it's fair to say I've seen lots of patients use tea tree oil for a variety of skin issues. It's a natural remedy that is known to help.
Simon Hodes, MB ChBFamily physician, Cleveland Clinic
1 more professional perspective
Niacinamide helps reduce the appearance of pores in a few ways. By strengthening the skin barrier and improving elasticity, pores appear less noticeable and more even.
Ashlyn YankeAesthetician, Cleveland Clinic
Ask an AI assistant about this product
Ask an AI assistant about this product
Opens ChatGPT, Perplexity or Claude in a new tab with the question prefilled. Claude asks you to sign in first.