What is benzoyl peroxide in skincare?
Benzoyl peroxide is an organic peroxide used topically for acne. It releases oxygen into the follicle, which kills Cutibacterium acnes – the bacterium that drives inflammatory breakouts – and mildly loosens the plug of dead cells at the same time.
Its great advantage is that bacteria do not develop resistance to it, unlike topical antibiotics. Over-the-counter strengths run from 2.5% to 10%.
What skin concerns does benzoyl peroxide treat?
It is most effective on inflammatory acne – red papules and pustules – and less so on plain blackheads, where salicylic acid or a retinoid does more.
Trial evidence is consistent, and importantly shows 2.5% works about as well as 10% with considerably less dryness and irritation. Starting low is genuinely the better strategy, not a compromise.
What ingredients are best paired with benzoyl peroxide?
Niacinamide, hyaluronic acid, ceramides and squalane offset the dryness it causes. Using it as a short-contact wash – applied, left five minutes, rinsed – gives most of the benefit with far less irritation.
Keep it away from retinoids and vitamin C in the same application, since it can oxidise them; use one in the morning and the other at night. It bleaches fabric, so expect marks on towels and pillowcases. Take our Skin Quiz.
What is hormonal acne?
Hormonal acne is acne whose timing and pattern track with hormonal activity rather than with cleansing habits or diet alone. It typically appears along the lower face – jawline, chin and upper neck – as deep, tender papules and cysts that flare on a predictable cycle.
It is most recognisable in adult women, where breakouts often arrive in the week before menstruation and settle again afterwards.
What causes hormonal acne?
Androgens – testosterone and DHT in particular – bind to receptors on the sebaceous gland and increase sebum production. When androgen activity rises or oestrogen falls, oil output climbs and follicles clog more readily.
Menstrual cycles, starting or stopping contraception, pregnancy, perimenopause and PCOS are the usual contexts. Stress raises cortisol, which amplifies the same pathway. Persistent hormonal acne with irregular cycles or excess hair growth is worth investigating medically.
What ingredients are best for hormonal acne?
Retinoids are the most effective topical, because they stop the plug forming regardless of how much oil is being produced. Azelaic acid reduces inflammation and the marks that follow, and niacinamide helps regulate sebum.
Salicylic acid keeps pores clear between flares, and benzoyl peroxide targets bacteria in inflamed lesions. Because hormonal acne is driven from the inside, topicals manage rather than cure it – consistency across the whole cycle beats spot-treating during a flare. Take our Skin Quiz.
