How do ingrown hairs occur?
"They can arise either when shaving or by natural means - due to an accidental twisting of a growing hair under the skin," explains dermatologist Nina Koutná, MD, of the GHC Prague Clinic. Inflammation in the follicles and ingrown hairs can also be encouraged by natural depilation with sugar paste, and can also occur more often when sweating in tight elastic clothing, for example during sports or long periods of sitting.