There's no denying the Trump aesthetic is a unique one. That creosote tan / comb-over combination being instantly recognisable the world over.

Questions about what's happening both in and on his head have been flying around ever since he announced his intention to run for office.

Having been Trump's doctor for 37 years, Dr Harold N. Bornstein has the inside track on the President's health. Dr Bornstein spoke to the New York Times and revealed the secret behind those locks.

In news that will devastate hair-plug and wig theorists, Dr Bornstein explained that the President takes a prostate-related drug, Propecia, to prevent hair loss and male pattern baldness.

The good news about Propecia is that it has a 90 per cent success rate.

The bad news is that once the treatment is completed, it only last for six months AND the reported side-effects include mental confusion and permanent sexual dysfunction.

Dr Bornstein - who has pretty impressive mane himself - also revealed the President took antibiotics to control rosacea, a common skin problem, and a statin for elevated blood cholesterol and lipids.

So there you go, it's all his hair - though a toupe sounds like a lot less hard work.