The AHA 2 BHA 2 Blemish Treatment Serum

Image: cosrx.com

COSRX

The AHA 2 BHA 2 Blemish Treatment Serum

A spot treatment built around AHA and Glycolic acid, for hydration and smoothing.

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Brand price

USD 23.00 · checked 25 Sept 2026 · on the brand's site

From the brand

What the brand says about this product. Our ingredient analysis follows below.

The brand recommends it for

  • Oily skin
  • Sensitive skin
  • Acne & blemishes
  • Uneven texture

How to use

1. Take out the cotton ball using the tongs included. 2. Gently tap a cotton ball directly onto target areas. *Depending on the area of concern, you may gently wipe the blackhead/whitehead on the nose and chin *For daytime use, please be sure to apply sunscreen.

What's inside

Ingredients List

1 trigger at least one check · 16 trigger none

clear
WaterSkin Conditioning
—
clear
PropanediolViscosity Controlling
0-1 / —
  • Hydrating
flagged
0 / 0
  • Fatty esters (glyceryl stearate, PEG-100 stearate)
  • Polysorbates (Tween emulsifiers)
  • May Worsen Seborrheic Dermatitis
clear
Glycolic AcidBuffering
0-1 / —
  • AHA
  • Glycolic acid
  • Anti-Aging
  • Brightening
  • Dark Spots
  • Exfoliating
  • Smoothing
clear
Salicylic AcidPreservative
—
  • BHA
  • Salicylic acid
  • Acne Fighting
  • Exfoliating
  • Oil Control
  • Pore Refining
clear
GluconolactoneSkin Conditioning
—
  • PHA
  • Exfoliating
  • Hydrating
clear
Zinc PCAHumectant
—
  • Zinc salt (sebum/soothing)
  • Acne Fighting
  • Oil Control
  • Reduces Irritation
clear
AllantoinSkin Conditioning
0 / 0
  • Reduces Irritation
  • Smoothing
clear
0 / 0
  • Hyaluronic acid
  • Hydrating
clear
0 / —

Key Ingredients

  • PHA1

    Polyhydroxy acids — larger and milder than AHAs.

    Gluconolactone

  • Zinc salt (sebum/soothing)1

    Zinc salts, used for sebum control and soothing.

    Zinc PCA

  • Polysorbates (Tween emulsifiers)1

    Polysorbate (Tween) emulsifiers.

    Polysorbate 20

  • AHA1

    Alpha hydroxy acids — water-soluble chemical exfoliants.

    Glycolic Acid

  • BHA1

    Beta hydroxy acid — oil-soluble, so it works inside the pore.

    Salicylic Acid

  • Glycolic acid1

    The smallest AHA, and so the most penetrating.

    Glycolic Acid

  • Salicylic acid1

    The BHA used in acne treatment.

    Salicylic Acid

  • Hyaluronic acid1

    Hyaluronic acid and its salts; a humectant that binds water to the skin.

    Sodium Hyaluronate

Benefits

Concerns

  • May Worsen Seborrheic Dermatitis1

    May feed the yeast involved in seborrheic dermatitis.

    Polysorbate 20

Ingredients Explained

Click on any ingredient to learn more about it

Dupes

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