A blackhead is a small, dark bump on the skin caused by a clogged pore that remains open at the surface. Unlike pimples, blackheads aren’t filled with pus and aren’t caused by dirt. The dark color comes from oxidation: when the oil and dead skin cells plugging the pore are exposed to air, they turn black, much like a cut apple browns on the counter.
How Blackheads Form
Your skin constantly produces an oily substance called sebum, which travels up through tiny channels (pores) to keep the surface moisturized. At the same time, your skin sheds dead cells. When excess sebum and dead skin cells collect inside a pore, they can form a plug that stretches the pore open. Because the pore stays open rather than sealing over, the material inside is exposed to oxygen and darkens through a chemical reaction called oxidation.
This is the key difference between a blackhead and a whitehead. Both are clogged pores, but a whitehead has a thin layer of skin covering it, trapping everything underneath. A blackhead has no cover, so air reaches the plug directly. Under a microscope, a blackhead shows a dramatically widened hair follicle, while a whitehead keeps its opening sealed shut.
What Causes Them
The biggest driver is sebum production, which is controlled largely by hormones called androgens. During puberty, androgen levels surge, which is why blackheads and acne peak in the teenage years. But hormonal shifts at any age, including menstrual cycles, pregnancy, and testosterone therapy, can increase oil output and trigger breakouts.
Other factors that contribute:
- Stress raises hormone levels that stimulate oil glands.
- Comedogenic products (heavy moisturizers, certain sunscreens, and makeup) can physically block pores.
- Friction or pressure on the skin from helmets, phone screens, or tight clothing can trap oil against the surface.
- Humidity and sweating create an environment where dead skin cells stick together more easily inside pores.
Blackheads cluster where oil glands are densest: the nose, forehead, and chin (the T-zone). They can also appear on the back, chest, and shoulders.
Blackheads vs. Sebaceous Filaments
Many people mistake normal pore structures for blackheads. Sebaceous filaments are tiny, threadlike formations inside pores that help channel oil to the skin’s surface. They’re most visible on the nose and look like small, flat dots that are usually gray, light brown, or yellowish, not the raised, distinctly dark bumps of a true blackhead.
The simplest way to tell them apart: blackheads are darker, slightly raised, and appear in scattered spots. Sebaceous filaments are lighter, flat, and spread evenly across an area. If you squeeze a blackhead, a dark, waxy plug comes out. Squeezing a sebaceous filament produces a thin, waxy thread, but it refills within about 30 days because it’s a normal part of your skin’s oil delivery system, not a clog.
Effective Treatments
Salicylic Acid
Salicylic acid is oil-soluble, meaning it can penetrate into the pore and dissolve the mix of sebum and dead cells that forms the plug. Over-the-counter products for acne typically come in concentrations of 0.5% to 2% in cleansers, toners, and leave-on treatments. Gels can go up to 5%. Daily use over several weeks gradually clears existing blackheads and helps prevent new ones.
Retinoids
Retinoids (vitamin A derivatives) work differently. They speed up the rate at which skin cells turn over and loosen the bonds holding dead cells together inside the pore. This prevents the buildup that leads to a plug in the first place. Adapalene, available over the counter in a 0.1% gel, is the most accessible option. Stronger retinoids require a prescription. Retinoids can cause dryness and peeling for the first few weeks, but this usually settles as your skin adjusts.
Benzoyl Peroxide
While best known for killing acne bacteria, benzoyl peroxide also helps break down the material inside clogged pores. It’s often combined with a retinoid or salicylic acid for a multi-angle approach. The American Academy of Dermatology recommends using topical therapies that combine multiple mechanisms of action for the best results.
Why You Shouldn’t Squeeze Them
Popping blackheads at home is tempting but counterproductive. Squeezing pushes bacteria and debris deeper into the follicle, which can turn a simple blackhead into an inflamed pimple or even a skin infection. Repeated picking also damages the surrounding tissue, increasing the risk of scarring and post-inflammatory dark spots that can take months to fade.
If you want blackheads physically removed, a dermatologist or trained esthetician can use a sterile comedone extractor with controlled, even pressure. This minimizes tissue damage and infection risk. Professional extractions are sometimes paired with chemical peels or retinoid treatments to keep pores clear longer.
Keeping Blackheads From Coming Back
Because blackheads are driven by your skin’s ongoing oil production, they tend to recur if you stop treating the underlying causes. A consistent routine matters more than any single product. Washing your face twice daily with a gentle cleanser removes surface oil without stripping the skin (harsh scrubbing actually triggers more oil production). Following up with a salicylic acid or retinoid product keeps pores clear over time.
Choose moisturizers and sunscreens labeled “non-comedogenic,” which means they’ve been formulated to avoid blocking pores. If you wear makeup, oil-free and water-based formulas are less likely to contribute to buildup. Changing pillowcases frequently and wiping down your phone screen can also reduce the amount of oil and bacteria that transfer to your face throughout the day.
For persistent blackheads that don’t respond to over-the-counter products after 8 to 12 weeks, a dermatologist can prescribe stronger retinoids or combination treatments tailored to your skin type and hormone profile.