Depends. These often arise when germs enter the hair glands at their base and fester or germs planted from scratching. Those near the anus may arise from a fistula inside the large intestine. Aggressive boils suggest you have a resident colony of staph in your nose.
Answered 9/1/2023
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If by boil, you're describing an abscess or similar skin infection. Usually they start as folliculitis, an infected skin follicle, which later turns into a pustule/white-head. If it gets worse, a "boil" forms involving deeper skin layers. The most common bacteria are the same ones that live on your skin surface (staphylococcus and streptococcus), then enter through a cut or irritated hair
Answered 9/1/2023
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