A blackhead is a small, dark bump on the skin caused by a clogged pore that remains open at the surface. Unlike a pimple, which is sealed and inflamed, a blackhead sits exposed to air, and that exposure is what gives it its distinctive dark color. Blackheads are one of the most common forms of acne, and they tend to cluster on the nose, chin, and forehead where oil production is highest.
How Blackheads Form
Every pore on your skin contains a tiny hair follicle and an oil gland. The gland produces sebum, a waxy substance that keeps your skin moisturized and protected. Normally, sebum travels up through the pore and spreads across the skin’s surface without issue.
A blackhead starts when the cells lining the inside of a pore begin to shed too quickly and clump together instead of exiting normally. These sticky dead cells mix with sebum and form a small plug deep in the pore, sometimes called a microcomedo. At this stage, you can’t see or feel anything on the skin. Over time, more oil and cellular debris accumulate behind that plug, and the pore gradually stretches open. Once the plug is wide enough to be exposed to air, the fats in the sebum oxidize and melanin (the pigment naturally present in skin cells) darkens. That’s the black dot you see. It’s not dirt.
This process distinguishes blackheads from whiteheads. A whitehead is the same type of plug, but the pore stays closed over it, trapping everything beneath a thin layer of skin. Because there’s no air exposure, whiteheads remain pale or flesh-colored.
Why Some People Get More Blackheads
The biggest factor is how much oil your skin produces, and that’s largely driven by hormones. Androgens, a group of hormones that includes testosterone, directly stimulate the oil glands to ramp up sebum production. People with higher androgen levels or oil glands that are more sensitive to normal androgen levels tend to produce more sebum, which makes blackheads more likely. This is why blackheads often first appear during puberty, when androgen levels surge, and why they can flare during menstrual cycles or periods of hormonal change.
Androgens also appear to promote the abnormal cell shedding inside pores that creates the initial plug, independent of their effect on oil production. Insulin and insulin-like growth factor (IGF-1) also increase sebum output, which is one reason high-sugar diets have been linked to acne in some studies. Genetics, certain cosmetics or skincare products that block pores (often labeled “comedogenic”), and humid environments can all contribute as well.
Blackheads vs. Sebaceous Filaments
Many people look at their nose in a magnifying mirror and assume every dark dot is a blackhead. In most cases, what you’re actually seeing are sebaceous filaments, which are a normal part of your skin’s structure. The distinction matters because it changes what you should do about them.
Sebaceous filaments are thin, tube-like collections of oil that line the inside of a pore. They help guide sebum to the skin’s surface. They don’t contain a plug, so oil flows through them freely. They tend to look like small, flat, grayish or light brown dots, and they’re usually smaller and lighter than actual blackheads. A true blackhead is a raised, distinctly dark bump where a solid plug of oxidized oil and dead cells is visibly blocking the pore opening.
If you squeeze a sebaceous filament, a thin, waxy thread may come out, but it will refill within a day or two because the structure is part of normal skin function. Squeezing blackheads produces a darker, firmer plug, but doing so creates its own problems.
Why You Shouldn’t Squeeze Them
It’s tempting, but squeezing or picking at blackheads typically makes things worse. The pressure can push bacteria and debris deeper into the follicle, which can rupture the follicle wall beneath the skin and trigger inflammation. What started as a simple clogged pore can escalate into a red, swollen pimple or even an infection. Repeated squeezing also damages the surrounding skin, potentially causing post-inflammatory darkening (hyperpigmentation) or scarring that lasts far longer than the blackhead itself would have.
Treatments That Work
Blackheads respond best to products that either dissolve the plug or prevent it from forming in the first place. Because the pore is open, topical treatments can actually reach the clog directly.
Salicylic Acid
Salicylic acid is a beta-hydroxy acid available in most drugstores, typically at a 2% concentration in cleansers, toners, and leave-on gels. It’s oil-soluble, which means it can penetrate into sebum-filled pores and dissolve the mix of dead cells and oil that forms the plug. Regular use helps keep pores clear and prevents new blackheads from developing. It’s generally the first thing to try for mild, surface-level blackheads.
Retinoids
Retinoids are vitamin A derivatives that work at a deeper level. They change how cells behave inside the pore, normalizing the shedding process so dead cells don’t clump together and form plugs. Over-the-counter options (like adapalene, sold as Differin) are effective for many people. Stronger prescription versions exist for more stubborn cases. Retinoids can cause dryness and irritation when you first start using them, so many dermatologists recommend applying them every other night initially and building up to nightly use.
How Long Treatment Takes
One of the most important things to know is that blackhead treatments work slowly. You may start to notice improvement in 8 to 12 weeks with consistent use, but it can take several months for comedonal acne to clear significantly. The reason is that treatments primarily prevent new blackheads from forming. Existing plugs still need time to work their way out. Many people quit after a few weeks thinking the product isn’t working, when they simply haven’t given it enough time.
Preventing New Blackheads
Because blackheads are fundamentally about oil and dead cells accumulating in pores, prevention focuses on keeping that process in check. A gentle, non-comedogenic cleanser twice a day removes excess surface oil without stripping the skin (which can paradoxically trigger even more oil production). Using a salicylic acid or retinoid product consistently, even after your skin clears, helps maintain the normal cell turnover inside pores that prevents plugs from forming.
Look for “non-comedogenic” on moisturizers, sunscreens, and makeup, which means the product has been formulated to avoid clogging pores. Heavy, oil-based products and anything that sits on the skin for long periods, like thick foundations, are common culprits. Pore strips can remove some surface-level blackheads temporarily, but they don’t address the underlying process, so blackheads tend to return quickly without an ongoing topical routine.
Keeping your hands away from your face also helps. Touching transfers oils and bacteria to the skin, and the friction itself can irritate pores that are already prone to clogging.