My mom has a cyst on her forehead from 1year.The cyst occured after a pimple appeared on the same area.It is of skin color and blue-green color. Once it got puntured and a semi liquid black substance was coming out from it. It does not pain but she is bothered due to cosmetic reasons. She visited a doctor who suggested her to undergo a surgery to remove the same but he is not sure about the recurrence of the cyst.Howover some people suggested not to disturb the cyst as it may cause cancer.