COSRX
Master Patch X-Large
An oversized hydrocolloid patch with niacinamide in the material, shaped to cover a whole zone rather than a single spot.
No reviews yet- Ships from our California warehouse
- Duties prepaid
- Suited to
- Uneven toneDullOilyCombination
- Helps with
- Uneven tone and dullnessExcess oilBarrier weakness
Sold out.
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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
One small patch cannot cover a cluster of congestion across a chin or a jawline, which is what the oversized cut is for. This is the extra-large patch in COSRX's Master Patch range, shaped to cover an area rather than a single point. It goes on last, on completely dry skin, and it holds best when everything under it is bare. The dressing takes up what the area gives off, and the parts of it that have been working turn cloudy. One patch per session, overnight, and it comes away best slowly from one edge.
Key benefits
- One patch covers a full zone such as the chin or forehead
- Niacinamide is built into the patch material
- Hydrocolloid absorbs fluid from clustered congestion overnight
- A gentler alternative to pore strips on the nose
Key actives
Niacinamide
tone support built into the dressing
Cellulose Gum
the absorbent core of the hydrocolloid dressing
COSRX Master Patch X-Large
What is the Master Patch X-Large designed to do?
This is an oversized hydrocolloid patch built on cellulose gum, hydrogenated poly(C6-20 olefin) and polyisobutene, the absorbent adhesive base shared across the Master Patch line, with niacinamide named last on the six-entry list. The larger cut is meant to sit over a wider zone, such as a chin or forehead cluster, rather than one isolated spot. Ten patches ship per box, sized for covering rather than spot-by-spot use.
Is this patch okay for skin that reacts easily?
Fragrance, essential oil, denatured alcohol and silicone are all absent from the ingredient list, along with parabens, sulfate surfactants, mineral oil and added colourant. The material list runs to only six entries total, cellulose gum and the copolymer base doing the adhesive work with niacinamide the active ingredient named on it. A short list lowers the number of things that could cause a reaction, though any individual ingredient, niacinamide included, can still affect specific skin differently.
Does one patch clear a breakout overnight?
A hydrocolloid patch works by drawing fluid out of a spot into the dressing itself, which is why the center turns visibly white or cloudy as it fills. That absorption happens over hours, not the moment it's applied, and niacinamide sitting in the material is a slow, repeated-use ingredient rather than a one-application fix. Replacing the patch once it's saturated, rather than expecting a single overnight patch to finish the job, is the realistic way to use it.
Can I wear this under makeup or with other blemish products?
The patch itself has a skin-toned, matte finish that can sit under makeup once it's fully pressed down. Because nothing on this ingredient list overlaps with a leave-on treatment like a salicylic acid serum, applying that kind of product to clean skin before the patch, rather than on top of it, keeps the two from interfering with each other. Layering order matters more than layering amount here.
How can I confirm this is a genuine Korean-market COSRX patch?
The EAN 8809598454774 is the barcode printed on the real box, worth checking against your unit directly. Beyond that, COSRX runs its own verification: the batch number and expiration date on your box can be entered on the verification page at cosrx.com. Reading those two codes off your own packaging is the actual check, not anything printed in this listing.
- 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
- Press one Master Patch X-Large over the area at the end of the evening routine, on clean dry skin.
- Smooth it down from the middle of the patch outward so the whole edge lies flat against the skin.
- Nothing goes over it, and the skin under it needs to be bare and dry for it to hold.
- One patch per session, overnight. Do not peel it off quickly; lift one edge slowly so it does not take skin with it.
Reviews
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COSRX, Korean-market original
X-large hydrocolloid patches, 10 ea, with 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 skin care, quoted from the medical sources linked beside each.
Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic 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
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