Ingrown hairs happen when a shaved hair curls back and pierces the skin instead of growing outward. The good news: most ingrown hairs are preventable with the right prep, technique, and aftercare. The key is keeping hair tips from becoming sharp enough to re-enter the skin, and keeping the skin clear so hairs can grow out freely.
Why Shaving Causes Ingrown Hairs
When you shave, you create a sharp, angled tip on each hair. As that hair grows back, it can curve downward or sideways and puncture the skin a few millimeters from the follicle. Your body treats this like a splinter, triggering an inflammatory reaction that produces those familiar red, itchy bumps or pus-filled spots.
There are actually two ways this happens. In the first, the hair emerges from the follicle and then loops back into the skin’s surface. In the second, the hair never even makes it out. If you shave against the grain or pull the skin taut while shaving, the cut hair retracts below the surface. Because the follicle is naturally curved, the sharp tip punctures the follicle wall from the inside. This second type tends to cause a more severe inflammatory response because the hair is trapped deeper in the skin, sometimes leading to scarring or dark spots that linger for weeks.
Choose the Right Razor
Multi-blade razors are designed to cut hair below the skin’s surface. Each blade catches the hair and pulls it slightly before the next blade cuts it shorter, delivering that ultra-smooth feel. But that’s exactly the mechanism that causes ingrown hairs: hair cut below the surface is more likely to curl inward as it regrows, especially if you have coarse or curly hair.
A single-blade safety razor or a quality disposable with one or two blades gives you more control and leaves the hair tip at or just above the skin’s surface. If you’re prone to ingrown hairs and currently using a five-blade cartridge, switching to a single blade is one of the highest-impact changes you can make.
Electric razors are another option worth considering. In a study of 340 men, 78.3% of blade-razor users reported skin problems like redness, dryness, razor burn, or cuts, compared to 49.4% of electric-razor users. Foil-style electric shavers trim hair just above the surface without pulling it below the skin line, which significantly reduces the chance of ingrowns.
Replace Your Blades Regularly
A dull blade tugs at hair instead of slicing cleanly, which creates jagged tips and increases irritation. Dermatologist Dr. Kristina Collins recommends replacing disposable blades every week and safety razor blades every five to seven shaves. If you notice the blade dragging, pulling at your skin, or any visible rust, swap it out immediately. Dull blades also raise the risk of bacterial infection since damaged skin is more vulnerable to microbes living on an old cartridge.
Prep Your Skin Before Shaving
Shaving works best on hydrated hair and clear skin. Wet your skin with warm water for two to three minutes beforehand, ideally in the shower. Warm water softens the hair shaft, making it easier to cut cleanly without pulling, and loosens dead skin cells sitting over follicle openings.
Exfoliating before you shave helps clear the path for hairs to grow out freely. Chemical exfoliants (products with alpha or beta hydroxy acids) dissolve the dead skin cells plugging follicles without the micro-tears that scrubs can cause. This matters because shaving itself is already a form of physical exfoliation. Layering a rough scrub on top of that can irritate skin and make ingrowns worse. A gentle chemical exfoliant used the night before or a few hours before shaving is a safer approach.
Always use a proper shaving cream, gel, or oil. These products contain lubricants like glycerin, coconut oil, or silicone-based compounds that help the blade glide over skin with less friction. Less friction means less trauma to the skin’s surface and fewer opportunities for inflammation. Avoid shaving with just water or soap, both of which dry out quickly and provide almost no glide.
Shave With the Grain
This is the single most important technique change for preventing ingrown hairs. Shaving with the grain means moving the razor in the same direction your hair naturally grows. On most of the face, that’s downward. On the neck, hair growth can change direction, so run your fingers over the stubble to feel which way the hair points before you start.
Shaving against the grain cuts hair closer to the root, sometimes below the surface. That below-surface cut is what allows the hair to retract into the follicle and pierce the wall from inside as it regrows. You’ll sacrifice a bit of closeness by shaving with the grain, but you’ll dramatically reduce the number of hairs that turn inward.
Use light, short strokes and let the blade do the work. Pressing hard forces the blade deeper and increases the chance of cutting below the skin line. Rinse the blade after every few strokes to keep it clear of hair and cream buildup.
Cool Down and Treat the Skin After
Rinse with cold water as soon as you finish shaving. Cold water acts as a natural astringent, tightening the skin and helping close pores that opened during the warm-water prep. This reduces post-shave inflammation and makes it harder for bacteria to enter freshly shaved follicles.
After drying (pat gently, don’t rub), apply a product containing 2% salicylic acid. Salicylic acid is a beta hydroxy acid that’s oil-soluble, meaning it can penetrate into the follicle and prevent the buildup of dead skin that traps hairs underneath. Using it consistently after shaving keeps follicle openings clear so new hair can grow straight out instead of curling under the surface. Look for a lightweight liquid or serum rather than a thick cream, which can clog pores.
Follow with a fragrance-free moisturizer. Hydrated skin is more pliable, which makes it easier for hair tips to push through rather than getting caught and redirected sideways.
Habits That Make a Difference Over Time
Shave less frequently if you can. Giving hair an extra day or two of growth means the tips are longer and less likely to curl back into the skin. If your routine allows it, shaving every other day instead of daily can cut ingrown frequency significantly.
Resist the urge to pick at or tweeze ingrown hairs. Pulling a hair out with tweezers often breaks it below the surface, setting up the exact conditions for it to grow back in again. If you can see a hair loop sitting just above the skin, you can gently lift it with a sterile needle, but don’t pluck it out entirely.
Wear loose clothing over freshly shaved areas on your body. Tight fabric presses against the skin and can redirect growing hairs sideways into the surrounding tissue, particularly on the bikini line, legs, and underarms.
When Ingrown Hairs Become a Bigger Problem
Most ingrown hairs resolve on their own within a few days once the hair breaks through or the bump drains. But when bacteria get involved, a simple ingrown can progress to folliculitis, a deeper infection of the hair follicle. Watch for pus-filled blisters that break open and crust over, or painful, swollen lumps (boils) that form under the skin. Clusters of connected boils, called carbuncles, signal a deeper staph infection. Severe or recurring folliculitis can cause permanent scarring and hair loss in the affected area, so infections that don’t improve with basic care within a week or that keep coming back are worth getting evaluated.