Master Patch Original Fit
Overnight hydrocolloid patches that absorb fluid and shield the blemish while you sleep, in a thin film that stays put.
No reviews yet- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- NormalCombinationDry
- Helps with
- Shoppers who want the full Master Patch Original Fit assembled as one purchase instead of sourcing each item on its ownConsistent use across every piece in the set, since a multi-step routine compounds over weeks of use rather than showing a result from one application
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.
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
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
- Press one Master Patch Original Fit onto clean, dry skin at the end of the evening routine.
- Dry the spot completely first, then press the patch from the middle outward so the edges sit flat.
- Leave it on overnight and take it off in the morning; put a fresh one on the next evening if it is wanted.
- One patch per spot per night. Do not apply one over a serum or a cream, and do not put one on broken skin.
COSRX Master Patch Original Fit
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.
Full INCI (7): Cellulose Gum, Styrene Isoprene Styrene Block Copolymer, Polyisobutylene, Petroleum Resin, Polyurethane Film, Liquid Paraffin, Tetrakis Methane
Ingredient list read from cosrx.com on 10 September 2026.
7 of 7 explained
- Cellulose Gum thickener
- Cellulose Gum is plant cellulose modified to dissolve in water. It thickens, holds particles in suspension and gives a smooth, slippery body.
- Styrene Isoprene Styrene Block Copolymer film former
- This is the rubbery backbone of a pressure-sensitive adhesive. It is what lets a patch sit on a curved surface for hours and still peel away in one piece.
- Polyisobutylene film former
- Polyisobutene is a synthetic polymer that forms a flexible, water-resistant film. It gives gloss and holds a formula in place, which is why it appears in lip products and long-wear textures.
- Petroleum Resin film former
- Petroleum Resin is a tackifier: it is what gives a hydrocolloid patch its grip on skin without a wet adhesive. It is inert and stays on the surface.
- Polyurethane Film film former
- Polyurethane Film is the thin backing sheet of a patch. It holds the hydrocolloid mass in place and keeps the outside dry while the side against skin stays sealed.
- Liquid Paraffin occlusive
- Liquid Paraffin is highly refined mineral oil. It is among the least reactive occlusives in cosmetics: it stays on the surface, slows water loss, and carries nothing into skin.
- Tetrakis Methane antioxidant
- This is a stabiliser that keeps the oils and fragrance in a formula from oxidising. Its job is the shelf life of the product rather than any effect on skin.
- Market
- Korean market, the version sold in Korea
- EAN (barcode)
- 8809598455726
- Made in
- Republic of Korea
- Category
- Hydrocolloid Blemish Patch
- Actives
- Hydrocolloid film
- Ships from
- California or Korea
Orders ship from California or direct from Korea with tracked delivery to your door, and both routes carry the same Korean-market release. Shipping is free on orders of $100 or more. Returns are accepted for 30 days, by mail.
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 - 2Barcode
Listed against the Korean barcode on its box - 3California or Korea
Ships to you from either, as the same Korean-market release
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. The barcode in the specification above is the Korean-market one and it is printed on the box you receive.
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.
Every order ships from California or direct from Korea, 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.
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
Inside the formula
Inside the formula
Reviews
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COSRX Master Patch Original Fit
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
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COSRX, Korean-market original
Overnight hydrocolloid blemish patches, thin film fit.
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.
Your skin barrier is basically your outer layer of the skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic
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