Blackheads and Enlarged Pores

The COSRX Salicylic Acid Daily Gentle Cleanseris the recommended starting point for most skin types. Its 1% salicylic aciddissolves oxidized sebum deep within the pores without stripping the skin. For skin types that desire more targeted action after cleansing, the COSRX BHA Blackhead Power Liquid effectively complements the routine by targeting the most stubborn blackheads, especially on the nose and chin.

Results in skin texture and apparent pore size are noticeable after 3 to 4 weeksof regular evening use.

Yes. Salicylic acid is the go-to active ingredient for blackheads because it is liposoluble: unlike water-soluble AHAs, it can penetrate the sebaceous follicle and unclog pores from within. Korean formulations often use 0.5 to 2%, an effective concentration that doesn't cause excessive irritation on unaccustomed skin.

Introduce gradually, only at night at the beginning of your routine, with sun protection in the morning, as salicylic acid slightly sensitizes the skin to UV.

Yes, provided you choose the right concentrations and formats. Sensitive skin types should opt for enzymatic exfoliants (like peeling gels) or low-BHA toners (0.5%) rather than concentrated serums. Brands like Anua and Beauty of Joseon formulate specifically for reactive skin, with soothing bases that offset the potential irritating effects of active ingredients.

The warning sign to watch for: skin that feels tight, stretched, or reddens after application. In this case, reduce the frequency before increasing the concentration.

For most active skincare products (BHAs, exfoliants), the recommendation is evening only, especially at the start of a routine and for unaccustomed skin. In the morning, a gentle cleanser without active ingredients and a mineral or chemical sunscreen are sufficient and protect skin that has been weakened by nighttime exfoliation.

Some light BHA toners, such as those from Anua, can be used morning and evening on accustomed oily skin, but this frequency is rarely necessary to achieve results on blackheads.

Hydrocolloid patches work on surface open comedones: they mechanically extract the pore's contents through absorption. Their effectiveness is immediate but superficial; they do not address the root cause, which is sebum overproduction and deep follicular obstruction.

Used in conjunction with a regular BHA routine, they accelerate targeted cleansing on specific areas (nose, chin). On their own, they are not enough to sustainably reduce blackheads or the appearance of enlarged pores.

To find out which products to combine for your skin, use the free skin diagnostic tool.