A blackhead is an open, clogged pore filled with oil and dead skin cells that has turned dark at the surface. Unlike whiteheads, which are sealed beneath a thin layer of skin, blackheads sit exposed to the air. That exposure is what gives them their distinctive color. Blackheads are one of the most common forms of acne, and roughly 85% of people between the ages of 12 and 25 experience some form of acne during that window.
How Blackheads Form
Your skin constantly sheds dead cells and produces an oily substance called sebum to keep itself moisturized. Normally, dead cells rise to the surface and flake away while sebum flows freely out of your pores. A blackhead forms when that process breaks down.
The cells lining the inside of a pore begin to multiply faster than usual and stick together instead of shedding. This creates a plug of dead skin and oil trapped inside the pore. If the pore stays open at the top, air reaches the plug, and the result is a blackhead. If the pore closes over completely, the same plug becomes a whitehead instead.
Why Blackheads Look Black
The dark color has nothing to do with dirt. When the trapped mixture of oil and dead skin sits exposed to the air, oxygen triggers a chemical reaction with the natural pigment (melanin) and fats in the plug. This oxidation darkens the surface of the material, producing the characteristic dark brown or black dot. Beneath the surface, the contents of a blackhead are actually yellowish or off-white.
Where They Show Up Most
Blackheads cluster in areas where your skin produces the most oil. The T-zone, the strip across your forehead and down your nose and chin, has a higher density of oil glands than the rest of your face. That’s why the nose is one of the most common spots for blackheads. They also appear on the chin, forehead, and along the jawline. Outside the face, the chest, back, and shoulders are frequent sites because those areas are also rich in oil glands.
Common Causes and Triggers
Several factors push your skin toward producing more oil or shedding cells unevenly:
- Hormonal shifts. Puberty, menstrual cycles, and stress all increase oil production. This is why blackheads peak during adolescence and why up to 20% of adult women still deal with acne.
- Skincare and cosmetic products. Heavy moisturizers, foundations, and sunscreens can physically block pores. Products labeled “non-comedogenic” claim not to clog pores, but the FDA does not regulate that term, so there’s no standardized testing behind it. Some companies now use computer modeling to predict whether a substance’s molecular structure is likely to block pores, but there’s no guarantee.
- Friction and pressure. Tight clothing, helmets, phone screens pressed against your face, and resting your chin in your hands can all trap oil and dead cells against the skin.
- Humidity and sweat. Warm, humid environments increase oil flow and make pores more likely to become congested.
Over-the-Counter Treatments
Salicylic acid is the go-to ingredient for blackheads. It’s oil-soluble, which means it can penetrate into the pore and dissolve the dead skin cells forming the plug. Over-the-counter products range from 0.5% to 2% in cleansers, pads, and solutions. Gels can go higher, up to 7%. A lower concentration in a daily face wash is a reasonable starting point. You won’t see results overnight; it typically takes several weeks of consistent use before pores start clearing.
Retinoids work differently. Instead of dissolving an existing plug, they speed up cell turnover so dead cells are less likely to accumulate in the first place. Adapalene, available over the counter at 0.1%, both prevents new blackheads from forming and helps loosen ones already present by disrupting the bonds holding dead cells together inside the pore. It can cause dryness and irritation at first, especially in the first two to four weeks, but it tends to be less irritating than older prescription retinoids.
Using both ingredients in the same routine is common, though introducing them one at a time helps you identify what’s causing any irritation. Salicylic acid works well as a cleanser or toner step, while a retinoid is best applied at night on dry skin.
Why You Shouldn’t Squeeze Them Yourself
It’s tempting, but squeezing blackheads at home carries a high risk of scarring. Fingernails apply uneven pressure, push debris deeper into the pore, and can tear the deeper layers of skin. When that damage triggers collagen repair, it often leaves behind pitting or dark marks that last far longer than the blackhead would have.
Professional extraction is a different story. In a clinical or licensed aesthetician setting, the skin is softened first with steam, enzymes, or gentle peels. Sterilized comedone extractors apply controlled, even pressure at the correct angle. The risk of scarring from professional extraction stays below 2% when proper protocols are followed. If you have stubborn blackheads that aren’t responding to topical products, professional extraction is the safer route.
Preventing New Blackheads
Prevention comes down to keeping pores clear and managing oil. A gentle, non-abrasive cleanser twice a day removes excess sebum without stripping the skin so aggressively that it triggers even more oil production in response. If you use a retinoid at night, a simple salicylic acid cleanser in the morning covers both major prevention strategies.
Pay attention to what you put on your skin. Lightweight, water-based moisturizers and mineral sunscreens are less likely to congest pores than heavy creams or chemical sunscreen formulas. If your T-zone is significantly oilier than the rest of your face, you can apply a lighter moisturizer there and a richer one on drier areas like your cheeks.
Changing pillowcases frequently, keeping your hands away from your face, and showering soon after sweating all reduce the amount of oil and bacteria sitting on your skin. These habits won’t eliminate blackheads on their own, but they remove some of the conditions that make clogged pores more likely.