While unable to confirm whether that explanation was the “whole truth”, Littara, who has performed the procedure on more than 3000 penises, said he had “implanted a more than generous dose of hyaluronic acid”.

“The result is immediate, so the athlete could wear the new suit after just a few minutes,” he said.

A study published in the academic journal Frontiers found a 2cm increase in the circumference of a ski suit could raise a jumper’s lift force by 5% and drag force by 4%, resulting in an estimated 5.8m increase in total jump distance.

FIS communications director Bruno Sassi said in an email to USA Today that there was no evidence any athletes had used the injection to “attempt to gain a competitive advantage”.

He added that 3D testing of athletes’ physical dimensions was used at the games to deter cheating.

“The main goal is to identify and/or prevent possible manipulations or violations of equipment rules – notably, the intentional lowering of the crotch measurement to gain advantage over opponents,” Sassi said.

He added that ski suits were tested to ensure they were up to Olympic standards, and were microchipped so officials could scan them before each race to verify approval.

Providing further insight into the cosmetic use of hyaluronic acid, Littara said the substance must be reapplied regularly to maintain increased size.

“How often depends on individual characteristics, but realistically at least three times a year,” he said.

“Usually, at least 20ml of hyaluronic acid is implanted, but the amount can be customised according to individual needs.”