Hormonal acne: why does it return just before your period?

You had clear skin at twenty, but now pimples are appearing on your lower face at thirty, even forty. They often return a few days before your period, deep, sensitive, on your jawline and chin.

This is neither a hygiene issue nor a whim of your skin: it is adult female acne, and its mechanism is largely hormonal. Understanding it allows you to stop useless trials and aim for what really works.

Adult acne is not treated by stripping the skin, but by acting on what triggers it deep down.

What's happening in your skin

The sebaceous gland is sensitive to androgens, male hormones also present in women. When they stimulate the gland, it produces more sebum, the pore gets clogged, and the bacterium Cutibacterium acnes maintains inflammation. In adult women, it's not necessarily that androgen levels in the blood are high: the gland may simply be more sensitive to them. A significant proportion of patients actually have strictly normal hormone levels, sometimes with an isolated elevation of a metabolite, androsterone glucuronide, which reflects hormonal activity at the skin level itself.

This hormonal dependence explains the typical localization on the lower face. While the majority of adult women still experience an affliction similar to adolescent acne, the inflammatory form, consisting of papules and deep cysts, is distinctly concentrated on the jawline and chin.

Why it returns with your cycle

Throughout the cycle, the ratio between estrogen and progesterone changes. In the second half, just before menstruation, the drop in estrogen leaves the androgenic influence relatively more pronounced on the sebaceous gland. This is the window when many women see their lesions appear or worsen, often in the same places. This cyclical and monthly pattern is a strong sign of hormonally-driven acne, and it is precisely what guides the choice of treatment.

What really works

Topical retinoids, vitamin A derivatives like adapalene, are the cornerstone of local treatment. They unclog pores, act on the lesion preceding the pimple, and calm inflammation, making them also the reference maintenance treatment. Benzoyl peroxide complements this action by reducing bacteria without promoting resistance. Recent dermatological recommendations place these two active ingredients among the pillars of acne treatment.

Orally, when the condition is clear and cyclical, spironolactone is a serious option for adult women: it blocks the effect of androgens on the gland. A large British controlled trial showed a significant improvement in acne-related quality of life at twelve and twenty-four weeks compared to placebo, with infrequent and minor side effects. Estroprogestative birth control pills work on the same principle. These treatments require a medical prescription.

Oral zinc plays a supporting role: a synthesis of studies found a reduction in inflammatory lesions, particularly papules. Finally, reducing the glycemic load of the diet, meaning limiting fast sugars, has shown a measurable benefit on the number of lesions in several controlled trials.

What does not work

Stripping the skin is counterproductive: aggressive cleansers, alcohol, and repeated exfoliations damage the skin barrier, increase redness, and do nothing to address the hormonal cause. Local or oral antibiotics used alone and long-term promote resistance without treating the underlying issue; they should always be combined with benzoyl peroxide and limited in duration. As for multiplied "purifying" treatments, they give a false sense of control while drying out the skin, which can paradoxically reactivate sebum production.

When to consult without delay

Certain signs warrant medical attention: deep and painful lesions that leave marks or scars, acne that resists well-conducted local treatments for several weeks, or a real psychological impact. Additionally, very irregular periods, unusual hair growth, or hair loss may suggest a hormonal imbalance to be investigated. In these situations, management with spironolactone, appropriate contraception, or a hormonal assessment makes perfect sense.

The Paradermia approach

Our pharmacist does not offer a single protocol but a routine adjusted to your profile and tolerance. The principle: combine an effective active ingredient, most often a retinoid or a well-tolerated derivative, with treatments that repair the barrier rather than aggressing it, and introduce active ingredients gradually to avoid irritation that leads to abandonment. When the clinical picture suggests a marked and cyclical hormonal component, we clearly direct you towards a medical consultation, because some levers, in fact, require a prescription.

Frequently asked questions

Is my acne necessarily hormonal because it's on my jawline?
Localization on the lower face and chin, especially if it worsens before your period, strongly suggests a hormonal component. But only a doctor can confirm and, if necessary, prescribe a dosage or appropriate treatment.

Is a hormonal assessment necessary for all adult acne?
No. Many women have normal levels. The assessment is mainly justified in cases of associated signs such as irregular periods, excessive hair growth, or hair loss, which may suggest an imbalance to be investigated.

Does diet play a role?
Limiting fast sugars can help: several trials have shown a reduction in the number of lesions with a low glycemic load diet. This remains a complement, not a substitute for core treatment.