Frequent ingrown hairs are almost always caused by a combination of your natural hair texture, how you remove hair, and what your skin deals with afterward. An ingrown hair forms when a strand curls back or grows sideways into the skin instead of rising straight out of the follicle, triggering redness, bumps, and sometimes pus. If you’re dealing with them constantly, something about your hair type, grooming routine, or daily habits is setting the stage.
Your Hair Type Is the Biggest Factor
The shape of your hair follicle largely determines how likely you are to get ingrown hairs. Curved follicles produce tightly curled hair, and that curl encourages the hair to loop back into the skin once it’s been cut. This is why ingrown hairs disproportionately affect people with coarse, curly hair. Among men of African descent, chronic ingrown hairs (called pseudofolliculitis barbae when they occur in the beard area) affect between 45% and 85% of the population. Hispanic men are the next most affected group. But anyone with thick or curly body hair, regardless of background, faces a higher baseline risk.
Straight, fine hair can still become ingrown, but it happens far less often. If you’ve noticed ingrown hairs ramping up in areas where your hair is naturally coarser, like the bikini line, underarms, neck, or jawline, your hair texture is likely the primary driver.
How Shaving Creates the Problem
Shaving is the single most common trigger. When a razor cuts hair below the skin’s surface, the freshly sharpened tip can catch on the follicle wall as it grows back, piercing into the surrounding skin rather than emerging cleanly. Multi-blade razors make this worse because they’re designed to pull the hair slightly upward before cutting it, leaving the remaining stub just below the skin line. That stub then has to push through more tissue to reach the surface, increasing the chance it veers sideways.
Single-blade razors cut hair precisely at the skin surface, which significantly reduces the risk of ingrown hairs. They also make fewer passes over the skin per stroke, which means less irritation overall. If you’re getting ingrown hairs primarily in areas you shave, switching to a single-blade safety razor is one of the most effective changes you can make.
A few shaving habits compound the problem. Shaving against the grain gives a closer cut but forces the hair to retract further below the surface. Shaving over dry skin or with a dull blade increases irritation and micro-cuts that can trap hairs as the skin heals. Pressing the razor too firmly has the same effect. Shaving in the direction of hair growth, using a sharp blade, and applying a lubricating shave gel all reduce friction and keep hair tips above the skin line where they belong.
Waxing and Plucking Carry Similar Risks
Other hair removal methods aren’t automatically safer. Waxing and tweezing pull hair out from the root, which sounds like it should solve the problem. But when the follicle regenerates a new hair, that hair is often finer at the tip and weaker, making it more prone to curling under the skin before it breaks through. The trauma of being ripped out can also slightly distort the follicle’s angle, so the replacement hair grows in a different direction than the original.
If you wax or tweeze regularly and notice ingrown hairs appearing a week or two later as the hair regrows, the removal method itself is the cause. Exfoliating the area gently in the days after waxing helps thin the layer of dead skin cells that new hairs have to push through.
Tight Clothing and Friction
Friction from clothing is an overlooked cause, especially for ingrown hairs on the thighs, buttocks, groin, and underarms. When tight fabric repeatedly presses against freshly shaved or waxed skin, it pushes new hair growth flat against the surface. The combination of heat, sweat, and pressure creates an environment where hairs get trapped beneath the skin instead of growing outward. This is particularly common in people who exercise in synthetic, close-fitting gear.
Wearing a clean, absorbent cotton layer between your skin and tight outer clothing reduces heat and friction. Loose-fitting underwear and breathable fabrics in the days following hair removal give new growth room to emerge without being pressed back into the skin. If your worst ingrown hairs show up along the lines where underwear elastic or waistbands sit, friction is almost certainly contributing.
Hormonal Changes Can Increase Your Risk
If you’ve noticed your body hair becoming thicker, darker, or growing in new areas alongside an increase in ingrown hairs, hormones may be involved. Higher levels of androgens (a group of hormones that includes testosterone) can cause hair follicles to produce coarser, denser hair. In women, this is called hirsutism, and the most common cause is polycystic ovary syndrome (PCOS). Other signs of elevated androgens include irregular periods, acne along the jawline, and thinning hair on the scalp.
Coarser hair is simply harder for the skin to accommodate. It’s more rigid, so when it curls, it pushes into the skin with more force. If the increase in ingrown hairs seems to have come on gradually alongside other changes in your hair or skin, it’s worth having your hormone levels checked.
Dead Skin Traps Hair Underneath
Your skin constantly sheds dead cells from its surface. When those cells build up, especially in areas prone to dryness or friction, they form a barrier that new hairs struggle to penetrate. The hair keeps growing but can’t break through, so it turns sideways under the skin. This is why ingrown hairs tend to cluster in areas where skin is thicker or where you don’t exfoliate regularly, like the backs of the thighs or the neck.
Regular exfoliation with a gentle scrub or a chemical exfoliant containing salicylic acid keeps that layer of dead skin thin enough for hairs to emerge. Doing this two to three times a week, particularly in the days after shaving or waxing, makes a noticeable difference. Moisturizing afterward keeps the skin soft and pliable, which further reduces resistance against growing hair.
When Ingrown Hairs Become Infected
Most ingrown hairs resolve on their own within a week or two. The bump forms, the trapped hair eventually breaks through or is absorbed, and the redness fades. But if bacteria enter the irritated follicle, an ingrown hair can develop into a deeper infection. Signs that an ingrown hair has become infected include increasing warmth around the bump, spreading redness, significant pain, and pus or fluid that looks cloudy rather than clear. The bump may grow into a firm, painful boil.
Staphylococcus bacteria, which live naturally on the skin’s surface, are the most common cause of these secondary infections. Picking at or squeezing ingrown hairs introduces bacteria into the broken skin and dramatically raises the infection risk. Resist the urge to dig out the hair with tweezers or a needle. A warm compress applied for 10 to 15 minutes several times a day softens the skin, draws the hair closer to the surface, and encourages drainage without creating an open wound. If the area becomes increasingly swollen, develops a crust, or the redness starts spreading outward from the bump, that warrants medical attention.
Reducing Ingrown Hairs Long Term
There’s no single fix because ingrown hairs usually result from several factors working together. But stacking small changes produces real results:
- Switch to a single-blade razor and shave with the grain, not against it.
- Exfoliate regularly in areas where you remove hair, especially two to four days after shaving or waxing.
- Moisturize daily to keep skin soft enough for new hairs to push through.
- Wear breathable, loose-fitting clothing over freshly shaved areas for at least 24 to 48 hours.
- Avoid touching or picking at bumps, which introduces bacteria and worsens scarring.
If these changes don’t make a dent, or if you’re dealing with dozens of ingrown hairs at a time, laser hair removal or prescription topical treatments that slow hair regrowth can break the cycle. Laser treatment works by reducing the total number of active hair follicles in a given area, which directly lowers the number of hairs that can become ingrown. It’s most effective on dark hair against lighter skin tones, though newer devices have broadened the range of skin and hair combinations that respond well.