Boils--also known as pilo--are also called skin abscesses. This can be caused by many things:
-- Ingrown hair
-- Splinter or a foreign object lodged inside your skin
-- Plugged-in acne
There are several types of boils:
Heradenitis
Multiple abscesses particular around the groin
Cystic acne
Dandi-for bhanchan ni? Dandi-for paknu lai pani boil bhanchan. Yo chai teenagers haru lai huncha usually.
Pilonidal cyst
This is a boil that happens in the crease of the buttocks. Prolonged sitting usually causes this because the hair follicle is irritated for a long time

Treatment:
Early treatment is best to avoid future pain. Use heat application--hot packs or hot soaks are good. They help the automatic response from the body because they increase the blood flow in the area.

Don't pop your boil unless it's administered by a medical personell! You could get infected. I would strongly discourage it. The boil should pop by itself eventually.

Just use proper hygiene like highvoltage said.