Causes

Shaving, waxing, or plucking hair too closely
Wearing tight clothing that causes friction
Naturally curly or coarse hair
Symptoms

Small, round bumps that may contain pus
Redness and inflammation
Itching or discomfort in the affected area
Treatment
Apply a warm compress to reduce swelling

Use exfoliating cleansers to remove dead skin
Avoid shaving until the area heals
In severe cases, consult a dermatologist
Source: American Academy of Dermatology