What Is the Main Cause of Acne?

By Teresa Alasio, MD | Intentional Self Aesthetics, New Canaan, CT

Patients often ask me this expecting a one-word answer. Dirt. Chocolate. Stress. The truth is that acne is not caused by one thing. It is a chain reaction, and every link in that chain matters.

Here is what actually happens. Each pore in your skin contains a hair follicle and an oil gland. Acne begins when the cells lining that follicle stick together instead of shedding normally. At the same time, the oil gland produces more sebum than the pore can handle, usually in response to hormones called androgens. The trapped oil and cells form a plug. A bacterium called C. acnes, which lives on everyone’s skin, multiplies inside that plugged follicle. Your immune system responds, and the result is the redness, swelling, and tenderness you see on the surface.

So the main driver is not hygiene. It is biology. Hormones, genetics, and the way your individual skin cells behave set the stage. That is why a teenager can wash their face three times a day and still break out, and why acne often flares around hormonal shifts like puberty, menstrual cycles, pregnancy, and even perimenopause. Adult acne in women is far more common than most people realize, and I see it regularly in my New Canaan practice.

My training as a pathologist shapes how I think about this. Acne is a process happening at the cellular level, beneath the surface, well before a blemish appears. Scrubbing harder does not reach that process. In fact, aggressive scrubbing irritates the skin and can make breakouts worse.

The good news is that every link in the chain can be treated. We can normalize how cells shed, reduce oil production, calm bacteria, and quiet inflammation. The right combination depends on your skin, your hormones, and your history.

If you are frustrated with breakouts that keep coming back, I am happy to take a look and build a plan that addresses the actual cause. You can reach us at Intentional Self Aesthetics in New Canaan to schedule a consultation.