What blackheads are
A blackhead is a type of clogged pore, often called an open comedone. Each pore holds a hair follicle and an oil gland. When oil (sebum) and dead skin cells collect in the opening and the top stays open to the air, the plug darkens. The dark color is widely attributed to oxidation of the oil and skin material, and to pigment in the skin, rather than to trapped dirt. That detail matters, because it means scrubbing harder does not remove them.
Blackheads are common on the nose, chin and forehead, where oil glands tend to be larger and more active. They are a mild form of acne. They are not infections and they are not a sign of poor hygiene.
Why they tend to come back
A pore that has been cleared can fill again because the underlying factors have not changed: oil production, how quickly skin cells shed, and the shape of the pore. Genetics, hormones and the products you use can all influence these. This is why people often find that blackheads need ongoing, low-key maintenance and not a single fix, and why expecting them to vanish permanently is unrealistic.
Safe habits that may help
Cleanse gently and consistently
Washing once or twice daily with a mild cleanser removes surface oil, sweat and sunscreen. Good face cleansing means lukewarm water, fingertips and no hard rubbing. Overwashing or very harsh products can leave stripped skin that is irritated, and irritation can make pores look more noticeable.
Consider a pore-clearing ingredient
Salicylic acid is oil-soluble, which means it can work inside the pore, and it is among the most commonly used ingredients for blackheads. Some people use a low-strength cleanser or leave-on product a few times a week. Other chemical exfoliants, such as glycolic acid, work on the surface and are also used to loosen dead skin cells. Retinol products and prescription retinoids are widely used for clogged pores too, but they typically need a slow introduction and can be drying.
Whatever you choose, add one product at a time, follow the directions, and watch for stinging, peeling or redness. Overdoing exfoliation is a common mistake, and recovery from skin over-exfoliation can take a while. If you are not sure how often is too often, start with fewer applications than the label allows.
Moisturize and use sunscreen
Skin that is properly moisturized is generally easier to treat, and heavy, greasy products can sometimes make congestion worse. A light lotion or gel is often enough. Daily sunscreen remains important if you are using exfoliating acids or retinoids, since these can make skin more sun-sensitive.
Give it time
Blackheads usually improve gradually. A reasonable time frame to judge a change is several weeks to a couple of months. If you see no improvement, or skin becomes irritated, it is better to stop and ask for advice than to keep adding products.
What to avoid
Squeezing and picking
It is tempting to squeeze a blackhead, and sometimes it looks like it has worked. But pressing on skin can break the wall of the pore, push material deeper, cause inflammation, and leave red or dark marks or small scars. Fingernails can also introduce bacteria. The urge to pick is understandable, and the principles of picking pimples apply here too: hands-off is the safer choice.
Pore strips and peel-off masks
These can lift out the top of some blackheads, which is why people like them, but the effect is temporary and they can irritate or tear delicate skin. If your skin is sensitive, red or breaking out, they are best skipped.
Homemade remedies
Ideas such as toothpaste, baking soda, lemon juice or sugar scrubs are popular online. They are not designed for skin, and they can sting, dry out or damage the surface. There is no good reason to expect them to outperform gentler, well-understood options.
Abrasive scrubs and rough tools
Gritty scrubs, stiff brushes and metal tools can scratch and inflame skin. Even gentler cleansing brushes do not need to be used more than occasionally, if at all.
Professional options
If blackheads bother you, a licensed professional can perform extractions with proper tools and technique, which is far safer than doing it yourself. A doctor or dermatologist can also discuss prescription treatments and rule out other things. Some small bumps that look like blackheads or whiteheads are something else; for example, milia bumps are tiny cysts rather than clogged pores, and they respond differently to treatment.
Seek advice sooner if bumps become painful, inflamed or widespread, or if you are unsure what you are dealing with. For persistent or worsening skin problems, a qualified health professional is the right person to ask.
Keeping expectations realistic
Pores cannot be opened or closed, and their size is largely determined by genetics and age, so no product permanently shrinks them. What you can do is keep them from filling up as often, which usually makes them look less noticeable. Gentle, consistent care and patience tend to be more productive than chasing a quick, dramatic result, and results vary from person to person.