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Peach 70 Niacin Brightening Collagen Mask$18.83COSRX
Master Patch Intensive
A hydrocolloid patch with salicylic acid and tea tree leaf oil on a short list, pressed over a spot at the end of the evening.
No reviews yet$17.99
90 ea
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- TexturedCongestedOilyCombination
- Helps with
- Rough surface textureExcess oilBreakouts and congestion
In stock. Ships from California or direct from Korea
You’re $100.00 away from free US shipping.
- Ships from California or direct from Korea
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
The Master Patch Intensive is a 90ea patch, used apply a patch from it to clean, dry skin at the end of the evening routine. The exfoliant it is built around is Salicylic Acid, named fifth on its own ingredient list. The same list carries Hydrogenated Poly(C6-14 Olefin), so the exfoliant is not the only thing on it worth naming. How much of the Salicylic Acid stays on the skin, and for how long, is decided by the patch format rather than by the list alone. This is the Original Korean Formula, the patch COSRX sells in Korea, Salicylic Acid and all.
Key benefits
- Mask, from COSRX's Korean-market lineup, 90 ea
- Ships with its Korean barcode and batch code intact, not swapped for an export label
- COSRX verifies units itself, on cosrx.com, against the batch number and expiration date printed on your unit.
Key actives
5Salicylic Acid
a BHA that works inside the pore to clear out oil and dead surface cells
6Melaleuca Alternifolia (Tea Tree) Leaf Oil
tea tree oil, included for its use against blemish-prone, oily skin
Inside the formula
Inside the formula
6
Ingredients declared
No fragrance
on the list
5Salicylic Acid6Melaleuca Alternifolia
- 5Salicylic Acid
- 6Melaleuca Alternifolia
Where each key active sits on the declared ingredient list, by entry number. Position is proportion: the further forward, the larger its share.
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 Salicylic Acid and not three changes at once.
Is this the Korean-market patch or a US version?
The Korean-market one, Salicylic Acid and all. We match this patch to its Korean barcode before it reaches the shelf, which is the check that tells you which market release you are holding.
What else is on the list besides Salicylic Acid?
Hydrogenated Poly(C6-14 Olefin). The order they are printed in on this patch's panel is the order on the box, so you can see where Salicylic Acid sits relative to them. Salicylic Acid itself is named fifth on it.
Full INCI (6): Cellulose Gum, Hydrogenated Poly(C6-20 Olefin), Polyisobutene, Styrene/Isoprene Copolymer, Salicylic Acid, Melaleuca Alternifolia (Tea Tree) Leaf Oil
Ingredient list read from jolse.com on 9 September 2026.
6 of 6 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.
- Hydrogenated Poly(C6-20 Olefin) emollient
- Hydrogenated Poly(C6-14 Olefin) is a synthetic hydrocarbon emollient. It gives a smooth, silicone-like glide and is completely stable, so it does not go rancid.
- Polyisobutene 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.
- Styrene/Isoprene Copolymer film former
- Styrene/Isoprene Copolymer is a synthetic rubber used in patch adhesives. Its contribution is elasticity: the film stretches with skin instead of lifting at the edge.
- Salicylic Acid exfoliant
- Salicylic Acid is a BHA, and the only common exfoliant that is oil soluble, so it can work inside a pore rather than only on the surface. It loosens the dead cells that block pores and is used for the look of congested, oily skin.
- Melaleuca Alternifolia (Tea Tree) Leaf Oil fragrance component
- Tea Tree Leaf Oil is an essential oil from an Australian shrub, carrying terpinen-4-ol. Korean formulas use it in products aimed at blemish-prone skin; it is potent, aromatic, and one of the essential oils most likely to bother reactive skin.
- EAN (barcode)
- 8809598454118
- Made in
- Republic of Korea
- Volume
- 90 ea
- Category
- Mask
- Actives
- Salicylic Acid, Tea Tree
- 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.
Payment and security
We accept
How to use
- Press one Master Patch Intensive onto clean, dry skin at the end of the evening routine.
- Pick the patch that covers the spot with a small margin, then press from the middle out until the edges lie flat.
- Leave it on overnight, take it off in the morning, and use a fresh one the next evening if the spot is still there.
- One patch per spot per night. Do not stick one over a serum or a cream, and do not reuse one that has been peeled off.
Worth knowing
- This formula carries an active acid, so pairing it with another exfoliant in the same routine is worth spacing out.
Reviews
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Cosrx Master Patch Intensive
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COSRX, Korean-market original
This one carries salicylic acid and tea tree leaf oil alongside the dressing itself, which is cellulose gum to take up fluid with polyisobutene and a styrene isoprene copolymer holding the film together.
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 the key actives in this formula, quoted from the medical sources linked beside each.
BHAs like salicylic acid get really deep into the pores, whereas the water-soluble ones don't go as deep.
Samantha Stein, PA-CDermatology physician assistant, Cleveland Clinic I think it's fair to say I've seen lots of patients use tea tree oil for a variety of skin issues. It's a natural remedy that is known to help.
Simon Hodes, MB ChBFamily physician, Cleveland Clinic
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