Whiteheads are small, flesh-colored or white bumps that form when oil and dead skin cells get trapped inside a pore that has closed over at the surface. Dermatologists call them “closed comedones,” and they’re one of the most common forms of acne. Unlike deeper, painful breakouts, whiteheads sit near the skin’s surface and don’t typically cause inflammation on their own, though they can progress to red, swollen pimples if left untreated or irritated.
How Whiteheads Form
Every pore on your skin contains a tiny hair follicle and an oil-producing gland. These glands release sebum, a waxy substance that keeps your skin moisturized. Problems start when the opening of the follicle becomes clogged with dead skin cells that don’t shed properly. Oil continues to build up behind the plug, and the mixture of sebum and skin cells fills the pore from the inside.
Because the surface of the pore stays sealed, the contents never get exposed to air. That sealed environment is what keeps whiteheads their characteristic pale color and gives them that slightly raised, bump-like texture you can feel under your fingertips.
Whiteheads vs. Blackheads
The difference is straightforward: a whitehead is a closed pore, and a blackhead is an open one. In a blackhead, the pore’s opening is stretched wide enough that the trapped oil and dead skin cells are exposed to air. Oxygen reacts with a pigment called melanin in the debris, turning it dark brown or black. It’s not dirt. A whitehead contains the exact same material, but the sealed surface prevents that oxidation from happening, so the contents stay white or yellowish.
Whiteheads vs. Milia
Milia are tiny, hard, white bumps that look a lot like whiteheads but behave differently. While whiteheads are clogged pores filled with oil, milia are small cysts filled with trapped dead skin cells beneath the surface. They feel firmer to the touch, don’t respond to typical acne treatments, and aren’t a form of acne at all. If you have persistent white bumps that don’t seem to go away with over-the-counter products, they may be milia rather than whiteheads.
What Causes Whiteheads
Hormones are the primary driver. Androgens, a group of hormones that includes testosterone, stimulate the oil glands to grow larger and produce more sebum. You don’t necessarily need high androgen levels for this to happen. Some people’s oil glands are simply more sensitive to normal hormone levels, which is why two people with identical bloodwork can have very different skin. Androgens also appear to directly increase the rate at which dead skin cells accumulate inside the follicle, independent of their effect on oil production, which means they contribute to both halves of the clogging process.
This hormonal connection explains why whiteheads are so common during puberty, before menstrual periods, during pregnancy, and when starting or stopping hormonal birth control. Any shift in hormone levels can tip the balance toward more oil and stickier skin cells.
Diet
There’s growing evidence that what you eat plays a role. High-glycemic foods (white bread, sugary snacks, processed cereals) raise insulin levels, which in turn can boost androgen activity and increase oil production. In a 12-week randomized trial of young men with acne, those who switched to a low-glycemic diet saw greater reductions in total acne lesions compared to a control group eating normally. Populations that eat almost no processed food, like the Kitavan Islanders of Papua New Guinea, have virtually no acne.
Dairy, particularly skim milk, has also been linked to higher rates of acne in several large studies, though the evidence isn’t as strong as it is for high-glycemic diets. The suspected mechanism involves naturally occurring hormones and growth factors in milk that may stimulate oil production.
Skincare Products
Certain cosmetic and skincare ingredients are comedogenic, meaning they physically block pores. Common culprits include acetylated lanolin, some plant oils like carrot seed oil, and thickening agents like carrageenan. If you notice whiteheads appearing in areas where you apply a specific product, the ingredient list is worth checking. Look for products labeled “non-comedogenic,” though that term isn’t regulated and isn’t a guarantee.
How to Treat Whiteheads
Two over-the-counter ingredients form the backbone of whitehead treatment: salicylic acid and benzoyl peroxide. They work differently, and for closed comedones specifically, salicylic acid has the edge. In a head-to-head clinical study comparing a 2% salicylic acid cleanser to a 10% benzoyl peroxide wash, only the salicylic acid produced a significant reduction in comedones. Salicylic acid is oil-soluble, which means it can penetrate into the pore itself and help dissolve the plug from the inside. Benzoyl peroxide is better at killing acne-causing bacteria, making it more useful for inflamed, red pimples than for whiteheads.
For a more powerful approach, topical retinoids are considered the gold standard for comedonal acne. Retinoids speed up the turnover of skin cells lining the follicle, which helps expel existing clogs and prevents new ones from forming. Over-the-counter options containing adapalene are available without a prescription, while stronger formulations require one. Retinoids can cause dryness, peeling, and sun sensitivity, especially in the first few weeks, so starting with a low concentration every other night is a common strategy.
How Long Treatment Takes
Most people need patience. Acne treatments typically take several weeks before you see meaningful improvement, and that delay is one of the biggest reasons people give up too early. Clinical data shows that non-inflammatory lesions like whiteheads decrease by roughly 25 to 45% within the first four weeks of consistent treatment. That’s noticeable progress, but it’s not a clear complexion. Full results often take 8 to 12 weeks of daily use. Sticking with treatment through the initial “nothing is happening” phase is one of the most important things you can do.
Why You Shouldn’t Pop Them
Squeezing a whitehead feels productive, but the mechanics work against you. When you press on a closed pore, material doesn’t just come out toward the surface. It also gets pushed deeper into the skin. That drives bacteria, oil, and inflammatory debris further into the dermis, which makes scarring more likely and can trigger new breakouts in the surrounding area. Bacteria from your fingers can also enter through the broken skin and cause infection. If a whitehead is particularly bothersome, a dermatologist can extract it with sterile instruments that apply even, controlled pressure, which is far less likely to cause damage than using your fingernails at home.
When Whiteheads Turn Into Bigger Breakouts
A whitehead is the earliest visible stage of acne. If the follicle wall weakens or ruptures under pressure, the trapped oil, bacteria, and dead cells spill into the surrounding skin tissue. Your immune system responds with inflammation, and the result is a red, swollen papule or pustule. If the rupture happens deeper, it can produce painful cysts or nodules that take weeks to resolve and are more likely to leave scars. This progression is why treating whiteheads early, before they have a chance to become inflamed, is a more effective strategy than waiting to treat full-blown breakouts.