What is BHA in skincare?
BHA stands for beta-hydroxy acid, and in skincare it almost always means salicylic acid. The defining difference from AHAs is solubility: BHA dissolves in oil, so it can move through sebum and exfoliate inside the pore rather than only on the surface.
It is also anti-inflammatory, which is why a blemish treated with BHA often looks less angry as well as less congested. Typical over-the-counter strengths are 0.5% to 2%.
What skin concerns does BHA treat?
Blackheads, whiteheads, congestion and mild to moderate acne respond best, because BHA clears the plug where it forms. It also smooths rough texture, helps keratosis pilaris and manages body and back breakouts.
Oily and combination skin see the most benefit, though even dry skin can use a low-strength BHA occasionally for congestion around the nose and chin.
What ingredients are best paired with BHA?
Niacinamide is the natural partner – it regulates oil and strengthens the barrier without competing. Hyaluronic acid, ceramides and glycerin replace the moisture exfoliation costs.
Azelaic acid and benzoyl peroxide complement it for acne, usually used at opposite ends of the day. Avoid stacking BHA with AHAs or retinoids in one step until your skin is used to it, and wear SPF daily. Take our Skin Quiz.
What are acne scars?
Acne scars are permanent changes in skin texture left behind after inflammatory acne damages the dermis. They fall into two families: atrophic scars, which sit below the surface as ice-pick, boxcar or rolling depressions, and hypertrophic or keloid scars, which sit raised above it.
What most people call scarring is often post-inflammatory hyperpigmentation or erythema – flat brown or red marks with no texture change. Those fade on their own; true atrophic scars do not.
What causes acne scars?
Scarring happens when inflammation reaches deep enough to destroy collagen and the repair process either lays down too little (atrophic) or too much (hypertrophic). Deep nodular and cystic lesions carry the highest risk.
Delaying treatment, picking or squeezing, and prolonged inflammation all increase the odds. Genetics play a large part in who scars and how, which is why two people with identical acne can heal very differently.
What ingredients are best for acne scars?
For flat marks, ingredients that speed turnover and calm pigment work well: retinoids, vitamin C, niacinamide, azelaic acid, alpha arbutin and AHAs, with daily SPF to stop marks darkening again.
For true textural scarring, topicals can soften but not erase – retinoids and peptides help remodel collagen over months, while in-clinic options like microneedling, resurfacing and subcision do the heavy lifting. Preventing new inflammation is the highest-value step. Take our Skin Quiz.
