Acne marks & texture
Red marks, brown marks and rough texture have different causes, so they respond to different ingredients. These guides explain the mechanism first, then rank cosmetic options by the strength of the evidence behind them.
How strong is COSRX BHA Blackhead Power Liquid?
Its 4% betaine salicylate carries about 2.2% salicylic acid by weight, paired with 2% niacinamide. Our analysis covers the evidence, US and Korean rules and a slow-start schedule.
Read the evidence: COSRX BHA Blackhead Power Liquid: Formula and Who It Suits →Is my acne mark PIE or PIH?
Press a clear glass on the mark: red marks that blanch are vascular PIE, brown marks that stay are PIH. Our guide compares the evidence for azelaic acid, niacinamide and sunscreen for each.
Read the evidence: PIE vs PIH: How to Tell Red and Brown Acne Marks Apart →Are these sebaceous filaments or blackheads?
Flat, evenly spaced gray dots are normal sebaceous filaments that refill; darker raised plugs are blackheads. Our guide compares the signs and the evidence for salicylic acid, retinoids and niacinamide.
Read the evidence: Sebaceous Filaments vs Blackheads: How to Tell Them Apart →Is this white bump a closed comedone or milia?
Soft, skin-colored bumps on the forehead and chin are closed comedones that respond to retinoids and salicylic acid; hard, pearly bumps around the eyes are milia, sealed keratin cysts that acids do not open. Our guide compares the signs and lookalikes.
Read the evidence: Closed Comedones vs Milia: How to Tell the Bumps Apart →
