Did he tell you to put an anitfungal cream on it?
When is your next app? If you are worried about it and want to know before the next app i'd make an earlier app.

When i lived on a boat and was always in the sun, i got a fungus on my L arm and back, it looked like the pigment was going on my skin, but it was just the fungus. I put a cream on it and it dissapeared relly quickly. Dr told me it was a fungus, but i don't know what sort......

Sorry i can;t be more helpful!