Hello,
From the symptoms,it sounds like a boil. Boils are caused by infection of the hair follicle by staph aureus.Bacterial skin infections can be spread by shared cosmetics or washcloths, close human contact, or by contact with pus from a boil or carbuncle.
Pls keep the area clean and apply some warm compresses and topical antiseptics. Also wear loose-fitting cotton clothing and use an antibacterial soap or mild soap like dove.Avoid any kind of cosmetics. Topical antibiotics such as mupirocin or neomycin containing ointment are also useful.In case the symptoms persist then oral antibiotics may be needed.Pls consult a dermatologist in that case.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional queries.Kind regards.
May be just a folliculitis.Apply mupurocin creme.