I just went through a similar situation. I had a mole on my big toe that had been their my whole life. However, I had a vague impression that over the last 5 or so years it got bigger and changed to an irregular shape. I finally got around to having it looked at after my cat scratched it. The general practice doctor thought it was the most dangerous and terrible looking mole ever... the dermatologist just laughed at it. Tests came back, completely harmless.
I'm not gonna lie, I was much, much more relieved that I wasn't gonna NPQ from it instead of it not being cancerous, so I know where you're coming from. Either way you're gonna get looked at by so many medical professionals at MEPs and then NOMI, someone is bound to notice it one way or another. Just get it looked at now.
(wait, nevermind, you're supply, so actually just MEPs might miss it =P (dunno how supply physicals work).... GET IT LOOKED AT)