Yes, ingrown hairs have a significant genetic component. Your genes determine hair texture, the angle hair grows from the follicle, and even the structural strength of the hair shaft itself. One specific genetic variation in a keratin gene increases your risk of chronic ingrown hairs sixfold. While shaving habits and skincare matter, the foundation of who gets ingrown hairs (and who doesn’t) is largely written into your DNA.
The Keratin Gene That Multiplies Your Risk
The most direct genetic link to ingrown hairs involves a gene called K6hf, which provides instructions for building a specific keratin protein in the hair follicle’s companion layer. A single-letter change in this gene’s code, known as the A12T polymorphism, weakens the structural scaffolding inside hair follicle cells. Carriers of this variation have a six times greater chance of developing pseudofolliculitis barbae, the clinical term for chronic ingrown hairs.
The weakened internal structure of the follicle appears to change how the hair exits the skin, making it more likely to curl back and pierce the surface rather than growing outward cleanly. Another keratin gene, KRT75, has also been flagged as a risk factor, reinforcing that the protein building blocks of hair play a central role in whether ingrown hairs become a recurring problem.
How Genes Shape Hair Curvature and Growth Angle
Beyond individual keratin mutations, your broader genetic blueprint controls the shape of the hair follicle itself. Several signaling pathways guide how follicles develop during embryonic growth, including their angle relative to the skin surface and whether they produce straight, wavy, or tightly coiled hair. Mutations in genes that regulate growth factors and follicle architecture produce different hair shapes and textures across human populations.
This matters because curvature is the single biggest mechanical predictor of ingrown hairs. A tightly coiled hair that’s been cut or shaved has a sharp tip that naturally curves back toward the skin as it grows. Straight hair, by contrast, tends to grow away from the surface. The degree of curl you’re born with is almost entirely genetic, which is why ingrown hairs run so strongly along population lines.
Why Certain Populations Are Hit Hardest
Pseudofolliculitis barbae affects 45% to 85% of men of African descent, a striking prevalence that reflects the genetic predisposition for tightly coiled hair in this population. A large study of 655 police students in Dakar, all of African descent with curly hair and required to shave weekly, confirmed the high incidence and identified family history of ingrown hairs as one of the strongest risk factors, with an odds ratio of 5. In practical terms, having a parent or sibling with chronic ingrown hairs made someone about five times more likely to develop them.
That family clustering is important. It shows the genetic influence isn’t just about hair type in a general sense. Even among people with similar hair textures, some families are far more affected than others, pointing to the specific keratin mutations and follicle structural differences that vary between individuals.
The Hormonal Connection
Genetics also influences ingrown hairs through hormone levels. Among women with chronic ingrown hairs, there’s a higher prevalence of excess androgen production, and 41% report a family history of excessive hair growth. Since both androgen levels and sensitivity to androgens are partly inherited, this creates another genetic pathway to ingrown hairs: more hair growing in coarser textures in areas prone to friction and shaving.
Genetic vs. Behavioral Risk Factors
Ingrown hairs sit at the intersection of genetics and grooming. You can carry a genetic predisposition and never develop problems if you don’t shave, wax, or otherwise remove hair. The Dakar study quantified this overlap clearly: shaving against the grain increased risk more than sixfold, using a single-blade razor roughly doubled it, and skipping shaving products added another 50% increase. Having keloid-prone skin, itself a genetically influenced trait, nearly tripled the risk.
Think of it this way: your genes load the gun, and shaving pulls the trigger. Someone with straight hair and no keratin mutations can shave against the grain daily and rarely get an ingrown hair. Someone with tightly coiled hair and the K6hf variation might develop them even with careful shaving technique. The genetic component doesn’t guarantee ingrown hairs, but it sets the threshold for how easily they occur.
Managing Ingrown Hairs When Genetics Work Against You
If your genetics make you prone to ingrown hairs, the most effective strategies fall into three categories: changing how you remove hair, treating flare-ups when they happen, and considering long-term hair removal.
On the grooming side, shaving with the grain instead of against it is one of the highest-impact changes you can make. Using a sharp, single-pass razor (rather than multi-blade razors that cut hair below the skin surface) and applying a proper shaving product both reduce the chance of hairs re-entering the skin. Letting hair grow to at least 1 to 2 millimeters before shaving again gives it enough length to clear the skin surface.
For people whose ingrown hairs persist despite grooming adjustments, laser hair removal has become one of the most effective long-term solutions. It works by reducing hair density in problem areas, which means fewer hairs available to become ingrown in the first place. The approach is safe across most skin types, though the specific technology and settings need to be matched to your skin tone to avoid complications. For someone with a strong genetic predisposition, laser treatment addresses the root cause more directly than any topical product can.