Why do I get acne before my period?

Because androgens, the hormones that drive oil production in the skin, have more influence relative to oestrogen in the days right before your period, and that shift shows up as breakouts that follow your cycle rather than appear at random. This is a real, well-documented pattern rather than something you are imagining: Mayo Clinic lists breakouts among the physical symptoms of premenstrual syndrome (PMS), and in a study of 400 women, 44% reported that their acne predictably flared before their period.

What's actually changing in your skin:

• Oestrogen falls, and androgens don't. Oestrogen has a mild calming effect on the skin's oil (sebaceous) glands. In the luteal phase, the days after ovulation and before bleeding starts, oestrogen drops sharply while androgen levels stay comparatively steady, so androgen's effect on oil production stands out more in this window than at any other point in the cycle.
• More oil means more clogged pores. Extra sebum combines with dead skin cells to block a pore, and a blocked pore is what a breakout actually is.
• It shows up in a specific place. The American Academy of Dermatology notes that hormonal breakouts cluster on the lower face, chin and jawline, and that predictably breaking out around your period is itself one of the signs that acne is hormonally driven rather than caused by a product or a habit.

This is a hormonal pattern, not a hygiene one, so no amount of extra cleansing addresses the cause. What helps in the ordinary sense: keeping a simple routine (a gentle cleanser, a non-comedogenic moisturiser) consistent through the whole month rather than only reacting once a breakout is visible, since the change underneath the skin starts several days before it shows.

The same hormonal window drives more than your skin. Discharge and tiredness follow a related schedule; see why discharge increases before your period and why the week before your period can leave you exhausted if either sounds familiar. Headaches are a common companion too, for the same reason; see why headaches happen before your period for the mechanism behind those. Mood swings often show up in the same window too; see why mood swings happen before your period for what's driving those. Breast tenderness follows the same hormonal calendar too; see why breasts feel tender before your period for what's driving that.

See a dermatologist if the breakouts are cystic, painful or leaving marks, if an ordinary routine is not helping after a few months, or if the pattern is clearly getting worse rather than staying the same from month to month. A dermatologist has options, from topical retinoids to hormonal treatments, that work on the androgen and sebum mechanism directly rather than on the breakout after it has already appeared.