Ingrown hairs occur when hair grows back into the skin instead of rising up from it. This can happen after shaving, waxing, or other hair removal methods, especially in areas like the face, legs, and bikini line. The trapped hair can cause irritation, redness, and sometimes infection. People with curly or coarse hair are more prone to ingrown hairs. To prevent them, it's important to exfoliate the skin regularly and use proper shaving techniques. If an ingrown hair becomes painful or infected, it may require treatment from a healthcare professional.