# COSRX Master Patch Original Fit

Overnight hydrocolloid blemish patches, thin film fit.

- Brand: COSRX
- Product: Master Patch Original Fit
- Price: $3.99
- Availability: Out of stock
- Market: Korean market, the version sold in Korea
- Made in: Republic of Korea
- EAN (barcode): 8809598455726

## Key benefits

- Hydrocolloid absorbs fluid overnight and turns visibly white as it works
- The film keeps pillowcases, fingers and grime off the spot
- A short material list with nothing to sensitize surrounding skin
- Stays adhered through a full night's sleep

## How it works

A blemish left uncovered overnight collects on a pillowcase and invites more picking. This film-based patch instead seals over the spot, its polyurethane film and polyisobutylene layer forming a barrier that stays put through movement and sleep. Underneath, cellulose gum draws fluid from the spot into the dressing rather than letting it sit against skin. Over several hours the center turns visibly white or cloudy as it fills. Press the edges down firmly on dry skin so the film holds through a full night.

## How to use

1. Press one Master Patch Original Fit onto clean, dry skin at the end of the evening routine.
2. Dry the spot completely first, then press the patch from the middle outward so the edges sit flat.
3. Leave it on overnight and take it off in the morning; put a fresh one on the next evening if it is wanted.
4. One patch per spot per night. Do not apply one over a serum or a cream, and do not put one on broken skin.

## Ingredients

Cellulose Gum, Styrene Isoprene Styrene Block Copolymer, Polyisobutylene, Petroleum Resin, Polyurethane Film, Liquid Paraffin, Tetrakis Methane

## FAQ

### What's in the Master Patch Original Fit and what's it for?

This is a hydrocolloid film patch built on cellulose gum and a styrene isoprene styrene block copolymer, with polyisobutylene, petroleum resin, polyurethane film and liquid paraffin rounding out the seven-entry material list. It comes in multiple sizes to fit differently sized spots. The patch functions purely as an absorbent dressing, with no separately named active ingredient added on top.

### Is this patch suitable for skin that reacts to adhesives?

Fragrance, essential oil, denatured alcohol, silicone, parabens, sulfate surfactants, mineral oil and added colourant are all absent from this list. The film itself is built on petroleum resin, liquid paraffin and polyurethane film, which are common patch-adhesive materials rather than skincare actives, so there's nothing added here beyond the dressing material itself. Anyone who reacts to adhesive bandages in general should watch for the same response here.

### How long does it take to see the patch working?

The film absorbs fluid from the spot underneath it gradually, turning visibly white or cloudy as it fills over the hours it's worn. That change in color is the sign it's drawing fluid out, not a sign the blemish has resolved underneath. Replacing the patch once it's saturated, rather than judging it after a few minutes, is how the absorption is meant to be read.

### Can I layer a spot treatment with this patch?

None of the seven ingredients here overlap with a treatment serum, since this patch is purely a dressing rather than a delivery system for actives. Letting a leave-on treatment absorb fully into dry skin before pressing the patch on keeps the film from sliding, since a damp surface won't hold the adhesive as well. Order matters more than which treatment you choose.

### How do I verify my Original Fit patches are authentic?

COSRX also runs its own verification, where the batch number and expiration date on your box get entered on the verification page at cosrx.com. That check relies on the codes printed on your own packaging, not on anything a listing states.

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Page: https://korean-pharmacy.com/products/cosrx-master-patch-original-fit