Sebaceous cyst...?

i had a strange characteristics of boil between my breasts...and often used to appear again after one or two months...its fundamentally painfull...it drains by itself..and vanishes and later again appear after one month...the doctor has said that it can be sebaceous cyst...presently i am worried a bit...that is it a chancy cyst...?can any body tel me that does it grow even bigger??its already very big..i am afraid of it.what should i do? Sebaceous Cysts are not risky. Your body simply produces them, but they cause you no injure... Below is a link around them. Putting a heating wad or a hot/wet washcloth can help drop off the pain...
no they are not chancy... they will burst but can come back.. sebaceous cyst technique a cyst of a oil gland.. resembling a infected hair follicle.. I don`t know antitiotics are needed...