This is the horrifying moment a 25-year-old cyst on an elderly man's back is popped.Footage captured on June 24 at a home in Bristol shows the bulging blemish on Dave Andrew's back.His daughter, Kerry, attacks the pus-filled sack with a scalpel – causing yellow gunge to ooze out from all directions.The pus seems endless, with some of it even leaking onto the carpet.Once the cyst is empty, Kerry jokes to her father: "You'll need a tummy-tuck now... you've got loose skin."The popping of the monster spot had to be done at home, says Andrews, due to a change in NHS policy.She told Newsflare: "The cyst has been there for a very long time."He had it drained on NHS 25 years ago, but it has slowly returned and they no longer do it on the NHS as it's classed as a cosmetic procedure."In the last few days before we popped it, he said it was getting sore and uncomfortable when he lays down."I was a bit concerned that I was hurting him but he said just go for it."