You get an ingrown hair when a hair that’s been cut or naturally shed curls back and grows into the skin instead of rising straight out of the follicle. This happens through one of two routes: the hair tip pierces the skin next to the follicle after it emerges, or it curls back inside the follicle itself and never breaks through the surface at all. Either way, your body treats the trapped hair like a foreign invader, triggering inflammation, redness, and those familiar painful bumps.
Why Hair Grows Back Into the Skin
The shape of your hair follicle is the single biggest factor. A curved follicle produces a tightly curled strand, and when that strand is cut short, the sharp tip follows the hair’s natural curl right back toward the skin’s surface. Instead of growing outward, it re-enters the top layer of skin like a tiny hook. Straighter hair can still become ingrown, but the odds are much lower because the strand’s growth path doesn’t arc back on itself.
Shaving makes the problem worse by creating a sharp, angled edge on each hair. That freshly cut tip acts almost like a small blade, making it easier to puncture the skin as the hair grows. Multi-blade razors compound this effect. The first blade lifts the hair and cuts it, and before it can settle, the next blade catches it, pulls it higher, and cuts again. After the final blade passes, the hair retracts below the skin’s surface. When it starts growing back, it’s already trapped under the skin with nowhere to go but sideways or inward.
Who Gets Ingrown Hairs Most Often
The main risk factor is having tightly curled, coarse hair. Among men of African descent, the chronic form of ingrown hair on the face and neck (known clinically as pseudofolliculitis barbae) affects between 45% and 85% of individuals. Hispanic men are the next most affected group. But ingrown hairs are not limited to any single demographic. Anyone who shaves, waxes, or tweezes can develop them, particularly in areas where hair is coarse: the beard area, bikini line, underarms, and legs.
Common Triggers Beyond Hair Type
Your hair’s natural curl sets the stage, but everyday habits determine how often ingrown hairs actually show up.
Shaving too close or too often. The closer the shave, the more likely the hair retracts below the skin line. Shaving against the grain gives a closer cut but also increases the angle at which the sharp tip meets your skin on regrowth. Shaving daily doesn’t give irritated follicles time to recover.
Waxing and tweezing. Both methods remove the entire hair from the root. When the new hair grows in, it has to find its way back through the follicle opening. If the opening has narrowed from inflammation or if dead skin cells have accumulated over it, the hair gets trapped underneath.
Friction from clothing. Tight clothing that rubs against your skin, especially in the pubic area, inner thighs, or neck, pushes newly emerging hairs back against the surface. This constant pressure can redirect a growing hair into the surrounding skin.
Dead skin buildup. When dead skin cells aren’t cleared away, they can block the follicle opening entirely. The hair continues to grow but has no exit, so it curls beneath the surface.
What an Ingrown Hair Looks and Feels Like
Most ingrown hairs appear as small, round, often reddish bumps that resemble pimples. You might notice a tiny dark dot at the center where the trapped hair sits just below the skin. They’re typically tender or itchy, and scratching or picking at them makes things worse. In lighter skin, the bumps tend to look red or pink. In darker skin tones, they often appear as darker, hyperpigmented spots that can linger long after the bump itself resolves.
Some ingrown hairs resolve on their own within a week or two as the hair eventually breaks through the surface. Others become more stubborn, filling with pus or forming a hard, cyst-like lump deeper under the skin. These deeper ingrown hairs are more painful and take longer to clear.
When Ingrown Hairs Get Infected
An ingrown hair creates a small wound in the skin, and that opening is an invitation for bacteria. The most common culprit is Staphylococcus aureus, a type of staph bacteria that already lives on your skin’s surface. Under normal conditions it’s harmless, but when it enters through a break in the skin, it can cause a genuine infection called folliculitis.
Signs that an ingrown hair has become infected include increasing pain, spreading redness, warmth around the bump, and pus that may be yellow or green rather than clear. A single infected ingrown hair usually responds well to warm compresses and keeping the area clean. Multiple infected bumps or ones that don’t improve within a few days may need topical or oral antibiotics.
How to Reduce Ingrown Hairs
If you shave, switching to a single-blade razor eliminates the multi-blade pulling effect that traps hair beneath the skin. Shave with the grain of hair growth rather than against it, and avoid pulling the skin taut while you shave. Using a sharp blade matters: dull razors require more passes, which increases irritation. Rinsing the blade after every stroke keeps it cutting cleanly.
Exfoliating the skin gently between shaves, either with a soft washcloth or a mild scrub, clears dead cells from follicle openings so hair can grow out freely. Chemical exfoliants containing salicylic acid or glycolic acid do the same thing without physical scrubbing, which is useful if your skin is already irritated.
Wearing looser-fitting clothing, particularly around the bikini line and neck, reduces the friction that pushes emerging hairs back into the skin. After any hair removal, keeping the area moisturized helps the skin stay soft enough for new hair to push through.
Long-Term Options for Chronic Cases
For people who get ingrown hairs repeatedly, the most reliable long-term approach is removing the hair permanently so there’s nothing left to become ingrown. Laser hair removal works by targeting the pigment in the hair follicle to damage it and slow regrowth. According to UCSF Health, the inflamed, bumpy skin caused by chronic ingrown hairs often improves significantly after treatment. Multiple sessions are needed, typically spaced several weeks apart, and the treatment works best on dark hair against lighter skin, though newer laser technologies have expanded the range of skin tones that respond well.
Growing a beard is the simplest solution for facial ingrown hairs, since the problem only occurs when hair is cut short enough to re-enter the skin. If that’s not an option, keeping facial hair trimmed to at least one millimeter in length, rather than shaving down to the skin, gives the hair enough length to clear the follicle opening without curling back in.