Acne 101: What’s Happening Under Your Skin

When a breakout decides to show up, it’s usually at the worst time—during a frigid Minnesota cold snap, right before college finals, or the morning of something you actually wanted to look forward to. Sound familiar?

Whether you’re a stressed-out student or an adult juggling work and winter weather, acne has a knack for showing up uninvited. And yes—adult acne is common too. Let’s dig into what’s really going on under your skin, which over-the-counter options are worth knowing, and when it makes sense to bring in a dermatologist.

Why there isn’t one “root cause” of acne

If you’ve been searching for the one thing to blame for your breakouts, you’re not alone. The frustrating truth is that acne is a multifactorial condition. In plain English, it usually reflects a mix of genetics, hormones, oil production, the way skin cells behave inside a follicle, bacteria, and inflammation.

What pushes one person’s skin into a breakout may barely register for someone else. That’s also the reassuring part: you didn’t do something wrong to “cause” your acne. Understanding the pieces is more useful than blaming yourself—or the last thing you ate.

What’s happening inside an acne breakout?

Here’s a quick look at four overlapping parts of the drama happening inside that pimple on your chin:

1. A pore gets plugged. Dead skin cells and sebum collect inside a hair follicle. If the plug stays closed, you may see a whitehead. If it opens, you may see a blackhead. That dark color is a chemical reaction at the surface—not dirt or “grime.”
2. Oil joins the buildup. Sebaceous glands make sebum, and hormonal shifts can increase production. When the follicle is already plugged, the oil-rich environment helps set the stage for a breakout.
3. Cutibacterium acnes gets involved. This bacterium normally lives on skin. Inside a plugged follicle, its interaction with oil, the follicle, and your immune system can contribute to acne. It isn’t as simple as “bad bacteria” landing on dirty skin.
4. Inflammation turns up the volume. Your immune response can produce redness, swelling, tenderness, and pus. When inflammation reaches deeper into the skin, a painful nodule or cyst can form and the risk of a scar is higher.

What can influence breakouts?

There are endless myths about what causes acne—chocolate usually gets dragged into this conversation—but a few factors really can matter. The catch is that they don’t affect everyone the same way.

• Hormonal shifts: Androgens can stimulate oil glands and hair follicles. That’s one reason acne often appears around puberty and why some people notice changes around menstrual cycles, pregnancy, or other hormonal transitions.
• Pore-clogging products: Some makeup, sunscreen, moisturizers, and hair products can contribute to breakouts where they touch the skin. “Non-comedogenic,” “oil-free,” or “won’t clog pores” is a reasonable place to start, though no label can promise that every product will work for every person.
• Diet: Some studies suggest that high-glycemic eating patterns may worsen acne for certain people, and observational studies have found an association with cow’s milk. The evidence is mixed. Pay attention to a repeatable pattern if you notice one, but don’t assume one food is the universal culprit or rely on diet alone to treat acne.
• Stress: Stress doesn’t create acne out of nowhere, but it can aggravate breakouts in someone who is already acne-prone. Finals week is not your skin’s favorite week either.
• Friction and sweat: Helmets, masks, tight equipment, and repeated rubbing can contribute to acne-like bumps. Gentle cleansing after sweating helps more than scrubbing.

Your skin may care a lot about one of these factors and not much about another. Part of managing acne is noticing patterns without turning every meal, stressful day, or new pimple into a detective story.

Over-the-counter options that actually help

You don’t necessarily need a prescription to get started. If your acne is mild, choose one active ingredient that fits the kind of breakouts you have, follow the label, and give it time. Starting three strong products at once is a very efficient way to end up irritated and unsure which one caused it.

• Benzoyl peroxide: This reduces acne-associated bacteria and can help inflamed pimples. Starting with a 2.5% product is a common way to limit dryness and burning. It can bleach towels, pillowcases, and clothing, so consider this your official warning not to use the good ones.
• Salicylic acid: This exfoliates inside the pore and can be useful for blackheads and whiteheads. It comes in different strengths and product types. Follow the label and pull back on other exfoliants if your skin becomes dry or irritated.
• Adapalene 0.1%: This topical retinoid helps keep pores clear and can treat blackheads, whiteheads, and pimples. The nonprescription label is for people age 12 and older and directs once-daily use over the affected area. Dryness or peeling can happen early. Use sunscreen, follow the Drug Facts label, and ask a doctor before use if you’re pregnant or breastfeeding.
• A gentle, non-comedogenic cleanser: Wash up to twice daily and after sweating with lukewarm water and your fingertips. More scrubbing is not more treatment.

A non-comedogenic moisturizer can make these treatments easier to tolerate—especially during a Minnesota winter, when cold air and indoor heat can leave already-irritated skin feeling even drier.

When should you see a dermatologist?

Don’t wait until you’ve “tried everything.” Acne treatment is gradual: it often takes about 6–8 weeks to see early improvement and several months for fuller clearing. But you don’t need to run an endless drugstore experiment if your skin is painful, scarring, or simply not getting better.

A dermatologist can confirm that it really is acne, sort out which kinds of breakouts you have, and build a plan around your skin and your life. That may include prescription treatment, but the point isn’t simply “stronger.” It’s using the right combination without making your routine harder than it needs to be. Learn more about Scenic Dermatology’s approach to acne treatment.