18yrs Old Teen got a 20cm tail removed from skin

Surgeons in India have removed a 20cm 'tail growing on a teenager’s lower back after he complained the growth had become too painful, reports say.
The family of the boy ignored the growth with the believe that it's a "GOOD LUCK CHARM"

Dr Pramod Giri, head of the neurosurgery department at Neuron Hospital, told the TOI: “Generally, the defect is detected very early as it is present from birth and since it grows with age it cannot remain undetected. see the x-ray growth

"But the parents as well as the child hid the fact all these years. Literature shows that the defect can be surgically corrected within few months of birth.”
He added: “When the size of the tail grew and a bone developed inside it, the tail began to press on the boy's back. It was cosmetically and psychologically disturbing for him. Hence the parents approached us.
“Though the surgery is not very demanding, it is done by a neurosurgeon as it involves a part of the spinal cord. It arises from a compression at the tail end of the back and is medically referred to as the neuron-development abnormality. This case is very rare and calls for a presentation in a medical journal as the tail is apparently the longest recorded so far.”
The boy’s family hid the growth as they feared he would be bullied because of the "social stigma", according to the Indian Express.
A vestigial tail left untreated can result in bowel and bladder problems, as well as loss of function in the legs, the site adds.