Salicylic acid for blackheads: how it works

Blackheads are one of the main reasons people buy salicylic acid. The ingredient does suit them, and the American Academy of Dermatology (AAD) says salicylic acid "works best on whiteheads and blackheads." It is still slow, and it is one of two good over-the-counter options. This guide explains what a blackhead is, how salicylic acid acts on it, how to use it, how long to wait, and when to switch to something else. For the ingredient in general, see the hub guide, what salicylic acid does for your skin.

What a blackhead is

The AAD's page on acne types says blackheads and whiteheads "appear when pores become clogged with excess oil, bacteria, and dead skin cells." A pore is the small opening of a hair follicle on the skin. If the clogged pore closes over, you see a small white or skin-colored bump, a whitehead. "If the pore fills with debris but stays open, you'll see a blackhead."

The AAD is clear about one common belief: "The black dots aren't dirt, so resist scrubbing. It will only worsen your acne." So skip hard scrubbing and hot water. The AAD says both irritate the skin.

The FDA's rules for acne products define a blackhead in similar words: "A condition of the skin that occurs in acne and is characterized by a black tip." Blackheads and whiteheads together are called comedones. They are acne, even when there are no red pimples.

How salicylic acid acts on the plug

Three properties of salicylic acid fit the problem inside a blackhead. A 2015 review in Clinical, Cosmetic and Investigational Dermatology describes them:

• It dissolves in oil. The review says salicylic acid is "lipid-soluble" and mixes with the oil in the skin and in the oil glands inside hair follicles. A blackhead is mostly oil and dead skin, so an ingredient that dissolves in oil can reach into it.
• It loosens dead skin cells. The review says salicylic acid "decreases adhesion of corneocytes," which are the dead cells on the skin's surface, "and causes loosening of these cells." Cells that stick together less are easier for the pore to shed.
• It lowers oil output. The review says salicylic acid "decreases secretion of sebum in patients with acne." Sebum is the skin's natural oil.

MedlinePlus puts it in one line: salicylic acid treats acne by "unplugging blocked skin pores." The FDA allows salicylic acid acne products to say they penetrate pores to reduce "blackheads" or "whiteheads."

How to use it on blackheads

1. Choose a product labeled for acne with 0.5 to 2 percent salicylic acid. That is the FDA range for over-the-counter acne products.
2. Start with a wash if your skin is sensitive. The AAD's page on large pores says: "Using a cleanser with salicylic acid may help. Studies show salicylic acid can unclog pores. Some cleansers containing salicylic acid are gentle enough to use every day." If it dries your skin, use a mild cleanser in the morning and the salicylic acid cleanser at night.
3. For a leave-on product, cover the whole area. The FDA's directions say to "cover the entire affected area with a thin layer." Blackheads on the nose sit in a wider area of oily skin, so treat the nose, the sides of the nose and the chin as one area if that is where they appear.
4. Start once a day. The same directions say to start with one application a day and increase only if needed.
5. Keep it out of the eyes, nose and mouth. MedlinePlus says to flush the area with water for 15 minutes if salicylic acid gets inside them.
6. Use a moisturizer. The AAD lists salicylic acid among acne treatments that dry the skin and says a daily moisturizer helps skin tolerate them.

Before a leave-on product covers your whole face, MedlinePlus suggests trying it on one or two small areas for 3 days. The guide how to use salicylic acid on your face covers daily use in more detail.

How long it takes

Blackheads take weeks to clear. The AAD's page on acne types says: "Give treatment six to eight weeks to work." Its page on habits that worsen acne adds: "Complete clearing generally takes 3 to 4 months." MedlinePlus warns that skin "may worsen during the first few days of treatment as your skin adjusts to the medication."

So judge the product at 6 to 8 weeks. Take a photo in the same light on day one and again every two weeks. The guide how long does an acne routine take to work explains why skin changes this slowly.

When adapalene fits better

The AAD recommends two different ingredients for blackheads on two different pages. Its adult acne page names salicylic acid. Its acne types page says: "To unclog pores, dermatologists recommend using a retinoid. You can buy one retinoid, adapalene, without a prescription. You'll also want to use a benzoyl peroxide wash."

The 2024 acne guideline from the Journal of the American Academy of Dermatology gives topical retinoids a strong recommendation and salicylic acid a conditional one. That is why Skinli's photo plan uses adapalene 0.1 percent for blackheads and whiteheads, and asks people to put salicylic acid aside while they use it. The two used on the same skin make irritation more likely, and both labels carry that warning.

A simple way to decide:

Situation	Reasonable choice
A few blackheads, sensitive skin, want a gentle start	Salicylic acid wash
Many blackheads and whiteheads, some small pimples	Adapalene 0.1 percent, the stronger evidence
Salicylic acid used for 6 to 8 weeks with no change	Switch to adapalene
Blackheads plus deep, painful lumps	See a dermatologist

The guide adapalene for blackheads and whiteheads covers that option.

Whiteheads respond the same way

Whiteheads are the closed version of the same clog. The AAD groups them with blackheads and names salicylic acid for both. Because the top of a whitehead is closed, the plug is not visible, and people often try to squeeze it. The same rules apply: a thin layer of salicylic acid on the whole area, once a day to start, and 6 to 8 weeks before judging it.

Habits that help pores stay clear

A salicylic acid product works better when the rest of the routine stops adding to the clogs. The sources agree on a short list:

• Wash gently, twice a day at most. The AAD says to wash up to twice a day and after sweating, with fingertips and a gentle cleanser, because scrubbing with cloths, sponges and other tools irritates the skin.
• Pick products that will not clog pores. NICE advises people with acne to avoid oil-based and comedogenic moisturizers, sunscreens and make-up. Comedogenic means likely to clog pores. The NHS says to use products labeled non-comedogenic and to remove make-up at the end of the day.
• Use lukewarm water. The AAD's page on pores says hot water can irritate your skin and make pores look larger.
• Wear sunscreen in the morning. The FDA advises sun protection with any BHA product, and salicylic acid is the most common BHA.

Keep going after they clear

Blackheads come back when the pores clog again. The AAD's page on acne that will not clear says: "Even when you see clearing, you'll want to keep using the acne treatment. This helps to prevent new breakouts." If salicylic acid cleared your blackheads, keep using the same product at the same pace.

Pore strips, tools and squeezing

Many "blackhead remover" products pull at the skin or push on it. The AAD's page on pimple popping says that popping acne yourself carries the risk of "getting an infection from the bacteria on your hands." NICE, the UK guideline body, says persistent picking or scratching of acne can increase the risk of scarring. The AAD's page on acne types says a dermatologist can remove stubborn blackheads with "a procedure like comedo (medical term for blackheads and whiteheads) extraction."

If you want a product sold as a blackhead remover, read the active ingredient line. If it holds salicylic acid between 0.5 and 2 percent, it is an ordinary salicylic acid acne product, and the same slow timeline applies.

When to see a dermatologist

The AAD says to see a dermatologist if blemishes remain after six to eight weeks of treatment. Also see one for deep, painful lumps, acne that leaves scars, or acne that changes fast. A dermatologist has prescription retinoids and can remove blackheads safely.