This procedure involves injecting a hardening chemical solution into the pile, which scars the tissue and reduces its blood supply.

The scarring causes the blood vessel to collapse and the pile to shrink and harden so that it eventually shrivels up about 4 to 6 weeks after treatment. This technique can be used to treat many piles simultaneously.

The procedure is very safe and few side effects are usually experienced. In some cases, patients may experience mild pain during the couple of days following treatment. Light rectal bleeding may also occur for a short period.