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Acne Pimple Master Patch Original Fit 4SET (96 Patches)
COSRX Acne Pimple Master Patch Original Fit 4SET is a 96ea patch whose ingredient list carries Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate alongside Liquid Paraffin.
No reviews yet$13.99
96ea
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Dry skinCompromised barrierDull, uneven tone
- Helps with
- Shoppers looking for Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate in a patchRoutines that want Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate and Liquid Paraffin in one stepFilling the patch step with a Korean-market formula
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- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
The Acne Pimple Master Patch Original Fit 4SET is a 96ea patch, used apply a patch from it to clean, dry skin at the end of the evening routine. The antioxidant it is built around is Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate, named seventh on its own ingredient list. The same list carries Liquid Paraffin, so the antioxidant is not the only thing on it worth naming. How much of the Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate stays on the skin, and for how long, is decided by the patch format rather than by the list alone. COSRX sells this Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate patch in Korea, and this is that version.
Key benefits
- Mask, from COSRX's Korean-market lineup, 96 ea
- COSRX verifies units itself, on cosrx.com, against the batch number and expiration date printed on your unit.
How to use
- Press a patch onto clean, dry skin at the end of the evening routine, once every leave-on layer has absorbed.
- Pick the size that covers the spot with a little margin, then smooth it down from the center until the edges lie flat.
- Leave it on overnight, take it off in the morning, and put a fresh one on the next evening if the spot is still there.
- 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 Acne Pimple Master Patch Original Fit 4SET (96 Patches)
Where does this patch go in my routine?
Apply a patch from it to clean, dry skin at the end of the evening routine. Toner goes on before it, and the rest of the routine goes on after you take the patch off. If you are adding it to a routine you already like, give it a week on its own first, so what you see is the Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate and not three changes at once.
What else is on the list besides Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate?
Liquid Paraffin. The order they are printed in on this patch's panel is the order on the box, so you can see where Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate sits relative to them. Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate itself is named seventh on it.
Full INCI (7): Petroleum Resin, Cellulose Gum, Styrene Isoprene Styrene Block Copolymer, Polyurethane Film, Polyisobutylene, Liquid Paraffin, Tetrakismethane
Ingredient list read from cosrx.com on 30 August 2026.
7 of 7 explained
- 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.
- 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.
- 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.
- 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.
- 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.
- Tetrakismethane 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
- Made in
- Republic of Korea
- Volume
- 96ea
- Category
- Mask
- 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.
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.
Inside the formula
Inside the formula
7
Ingredients declared
No fragrance
on the list
Worth knowing
- Patch test this patch on a small area and wait a day before using it more widely, especially with Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate on the list.
- Introduce this patch on its own for the first week, so anything your skin does is traceable to the Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate rather than to three changes at once.
Reviews
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COSRX Acne Pimple Master Patch Original Fit 4SET (96 Patches)
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
COSRX, Korean-market original
The Original Korean Formula patch from COSRX, 96ea formulated with Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate and Liquid Paraffin, shipped from California or direct from Korea.
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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