# COSRX Master Patch X-Large

X-large hydrocolloid patches, 10 ea, with Niacinamide.

- Brand: COSRX
- Product: Master Patch X-Large
- Price: $11.99
- Availability: Out of stock
- Size: 10ea
- Market: Korean market, the version sold in Korea
- Made in: Republic of Korea
- EAN (barcode): 8809598454774

## 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

## 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.

## How to use

1. Press one Master Patch X-Large over the area at the end of the evening routine, on clean dry skin.
2. Smooth it down from the middle of the patch outward so the whole edge lies flat against the skin.
3. Nothing goes over it, and the skin under it needs to be bare and dry for it to hold.
4. One patch per session, overnight. Do not peel it off quickly; lift one edge slowly so it does not take skin with it.

## Ingredients

Cellulose Gum, Hydrogenated Poly(C6-20 Olefin), Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate, Polyisobutene, Styrene/Isoprene Copolymer, Niacinamide

## FAQ

### 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.

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Page: https://korean-pharmacy.com/products/cosrx-master-patch-x-large