Frequent ingrown hairs are almost always caused by a combination of your hair type, how you remove hair, and how your skin handles regrowth. An ingrown hair forms when a hair shaft either curls back into the skin after it exits the follicle or pierces through the follicle wall before it ever reaches the surface. Your body treats that trapped hair like a foreign object, triggering inflammation that shows up as a red, painful bump. If you’re dealing with this constantly, something about your biology, your grooming routine, or both is stacking the odds against you.
Your Hair Type Is the Biggest Factor
Curved hair follicles produce tightly curled hair, and that natural curl is the single greatest risk factor for ingrown hairs. When curly hair is cut, the sharp tip grows back on a curved path and is far more likely to re-enter the skin than straight hair that grows outward. This is why ingrown hairs disproportionately affect people with coarse, curly hair. An estimated 45 to 83 percent of Black individuals in the U.S. military experience chronic razor bumps (the clinical term is pseudofolliculitis barbae), compared with about 18 percent of white individuals.
There’s also a genetic component beyond just curl pattern. Researchers have identified a specific gene variant in KRT75, which codes for a protein in the hair follicle’s inner lining. Carriers of this variant have a sixfold greater risk of developing chronic ingrown hairs. In one study, about 37 percent of Black participants carried the variant compared to roughly 11 percent of non-Black participants. So if ingrown hairs run in your family, that’s not a coincidence.
How Shaving Creates the Problem
Shaving cuts hair at a sharp angle, creating a pointed tip that can easily pierce skin as it regrows. The closer the shave, the worse this gets, because a very short hair can begin regrowing below the skin’s surface and never make it out. Multi-blade razors are especially problematic: the first blade lifts the hair while subsequent blades cut it below the skin line, practically guaranteeing the hair starts its regrowth journey trapped underneath.
Shaving against the grain gives you a closer cut, but it also tugs the hair and irritates the surrounding skin. That irritation causes minor swelling around the follicle opening, which can seal a regrowing hair inside. If you’re already prone to ingrown hairs, shaving against the grain dramatically increases your risk. Shaving with the grain leaves a slightly longer stub, but that extra length keeps the hair tip above the skin where it belongs.
Dull blades compound every one of these problems. A dull edge doesn’t cut cleanly. Instead it tears and pulls at hairs, creating jagged tips and more skin irritation. Using a fresh blade and prepping your skin with warm water before shaving makes a meaningful difference.
Waxing and Tight Clothing Play a Role Too
Shaving isn’t the only culprit. Waxing rips hair out at the root, and the new hair that grows back is finer with a tapered tip, which sounds like it should help. But waxing also traumatizes the follicle, and the regrowth can emerge at an odd angle or get trapped under skin that’s healed over the opening. Bikini waxes are especially notorious for causing ingrown hairs in the groin area, where the skin is thicker and the hair is coarse.
Friction from tight clothing pushes regrowing hairs sideways or back into the skin. Synthetic fabrics that don’t breathe also trap sweat and dead skin cells against the follicle, essentially sealing hairs in. This is why ingrown hairs cluster in areas where clothing fits snugly: the bikini line, inner thighs, neck (from collars), and underarms.
Dead Skin Cells Trap Hair Underneath
Even with the right hair removal technique, a buildup of dead skin cells on the surface can block the follicle opening and prevent hair from growing out normally. The hair keeps growing but has nowhere to go, so it curls sideways under the skin. This is why exfoliation is one of the most effective preventive measures.
Two types of chemical exfoliants work well here. Salicylic acid is oil-soluble, meaning it can penetrate into the pore itself to clear out debris and dead cells. It also reduces inflammation and has mild antimicrobial properties, so it helps with the redness and swelling around existing ingrown hairs. Glycolic acid works on the skin’s surface by loosening the bonds between dead cells so they shed more easily, keeping follicle openings clear.
Retinoid creams like tretinoin take a different approach. Applied nightly, they speed up skin cell turnover so that fresh cells replace the dead layer faster. This makes it harder for hairs to get trapped under old, accumulated skin. Retinoids are available by prescription, while salicylic acid and glycolic acid products are widely available over the counter.
When It Might Not Be Ingrown Hairs
Not every bump near a hair follicle is an ingrown hair. Bacterial folliculitis looks similar but is an actual infection of the follicle, usually caused by staph bacteria. The bumps tend to be itchy, filled with white or yellow pus, and can spread to follicles that haven’t been shaved or waxed. A yeast-driven version called pityrosporum folliculitis clusters on the back and chest and is often mistaken for acne.
If your bumps recur in the armpits, groin, or under the breasts, are deeply painful, drain fluid with an unpleasant odor, and leave tunnels or scars under the skin, that pattern points toward hidradenitis suppurativa. This is a chronic inflammatory condition that’s often misdiagnosed as recurring ingrown hairs or acne in its early stages. Mild cases involve one or two lumps in a single area, but the condition typically worsens over time without treatment. There’s no single test for it; diagnosis is based on the pattern of recurrence, location, and scarring.
Reducing Ingrown Hairs Long Term
If changing your shaving technique and exfoliating regularly aren’t enough, hair removal methods that target the follicle itself offer the most lasting results. Laser hair removal reduces ingrown hairs by up to 75 percent after just three sessions, and a full course of treatments can bring that number to 90 percent. The laser damages the follicle so it produces thinner, finer hair or stops producing hair altogether, which eliminates the sharp, curly regrowth that causes the problem. Electrolysis, which destroys follicles one at a time with an electric current, achieves about a 50 percent reduction. Waxing over time reduces ingrown hairs by roughly 60 percent as repeated removal gradually weakens the follicle.
For day-to-day management, the most effective routine combines several strategies:
- Shave with the grain using a single-blade razor or electric trimmer that doesn’t cut below the skin surface
- Exfoliate regularly with a salicylic acid or glycolic acid product between shaves to keep follicle openings clear
- Moisturize to keep skin soft so regrowing hairs can push through more easily
- Wear breathable, looser fabrics over areas where you frequently get ingrown hairs
- Avoid picking or squeezing existing bumps, which drives bacteria deeper and can cause scarring
If you have naturally curly or coarse hair, you may never eliminate ingrown hairs completely with shaving alone. In that case, switching to a trimmer that leaves hair at a short but visible length sidesteps the problem entirely, since the hair never gets short enough to retract below the skin and curl back in.