COSRX AC Collection Blemish Care Sheet Mask: The Acne-Specific Sheet Mask

COSRX's AC Collection is the brand's dedicated acne-care line, with formulations calibrated for active acne and the sensitive skin around it. The Blemish Care Sheet Mask takes the AC Collection's active blend (typically including salicylic acid, tea tree extract, and calming botanicals) and delivers it in a sheet mask format for 20 minutes of concentrated treatment. 10 sheets per box positions this as a weekly or twice-weekly intensive.

At $53.04 for 10 sheets, the per-mask cost is $5.30. That's premium for a sheet mask, but the AC Collection formulation justifies the price for acne-prone users who would otherwise spend more on multiple targeted spot treatments. The masks can substitute for leave-on BHA treatments on days when gentler intervention is preferred.

What It Does

The mask essence contains salicylic acid (BHA) to penetrate pores and clear congestion, tea tree extract for antimicrobial support against acne bacteria, and calming botanicals (centella, panthenol) to reduce the inflammation underneath active breakouts. 20 minutes of sheet mask contact delivers these actives more deeply than leave-on treatments because of the occlusive effect. Skin appears less inflamed, less red, and visibly calmer after use.

Who It's For

• Active acne sufferers: The AC Collection formulation targets this demographic specifically.
• Hormonal breakout cyclers: Weekly use during breakout-prone periods.
• Post-workout skin: Quick intensive after sweaty exercise to prevent clogging.
• Sensitive acne-prone skin: Gentler than leave-on BHA for reactive users.
• COSRX brand users: Fits with the full AC Collection lineup.

Key Specs

• Volume: 26ml x 10 masks
• Price: $53.04
• Hero actives: salicylic acid, tea tree extract, calming botanicals
• Sheet material: soft pulp
• Fragrance: mild, tea tree
• Wear time: 15 to 20 minutes

How to Use

On clean skin after toner, apply the sheet mask and smooth out air bubbles. Leave on for 15 to 20 minutes. Remove and pat remaining essence into skin. Follow with moisturizer.

Use 1 to 3 times per week, especially during breakout-prone periods or after workouts. Don't use same day as other strong actives (retinol, AHA). The BHA in the mask is sufficient active for one session.

FAQ

Will it replace my spot treatments?

For mild acne and prevention, mostly yes. For large, painful, or cystic acne, combine with a dedicated spot treatment (benzoyl peroxide or sulfur). The sheet mask provides broad treatment across the whole face; targeted spot treatment addresses individual stubborn spots.

Does the salicylic acid in the mask dry out skin?

Less than you'd expect. The BHA in a sheet mask is in a hydrating essence, so it delivers the active without the drying side effect common in spot treatments. Follow with moisturizer for best barrier support.

How does it compare to the regular COSRX sheet masks?

Standard COSRX masks (snail mucin, propolis) are hydration and nourishment focused. AC Collection masks are treatment-focused for acne. Pick based on goal: acne prevention/treatment (AC), hydration (snail), nourishment (propolis).

Can I use it during a breakout flare?

Yes, and this is when it's most useful. Use 2 to 3 times during a flare week to support skin recovery. After the flare calms, go back to 1 per week or less.

Is it safe for sensitive skin?

The formulation is calibrated for acne-prone skin, which often overlaps with sensitive. Tea tree can irritate some users; test on a small area first. If you experience stinging or redness, reduce use or discontinue.

Related Products

Pair with COSRX Salicylic Acid Daily Gentle Cleanser for the cleansing step. Browse the full COSRX collection and related Korean acne care.