Ingrown hairs bleed if the hair is pulled from underneath the skin, according to WebMD. To prevent ingrown hairs from occurring, it is recommended that a person wash the area with warm water to open up the pores, according to HealthGuidance.
Ingrown hairs are caused when the hair on a recently shaved face or body part curls and grows back into the skin rather than growing through the hair follicle, according to WebMD. As a result, small irritable bumps begin to surface on the skin that look like pimples or a boil-like sore. Ingrown hairs often afflict those with curly or coarse hair.