Posting on Instagram, the 2017 US PGA champion said he found a "very small mole at a time when there should be no problems going forward".

However, the 26-year-old American added how fortunate he was and urged anyone else who is regularly exposed to the sun to take caution.

"I recently had a scare at the dermatologist where a very small mole on my left leg was caught in the early stages of melanoma," he said.

“It is so important to make sure you're monitoring your body – no matter how old you are or how much sunscreen you use.” – Justin Thomas

"Luckily, we found it at a time where there should be no problems going forward. That being said, EVERYBODY GO GET CHECKED!! No harm can come from it and it's the best way to catch anything before it becomes a serious issue.

"Especially for all the junior golfers (and other athletes) spending so much time in the sun. It is so important to make sure you're monitoring your body – no matter how old you are or how much sunscreen you use. It really got my attention, and hoping it does the same to y'all!"