Wheel Grease?

[NativeTexan]

I have a 2016 Jayco Greyhawk that I picked up in December 2015, so bear with me as I am new to all of this. I have never owned a motorhome before. I have put almost 24000 miles on it this year already and am enjoying it, other than a few small annoyances that have popped up here and there, mostly underwhelming workmanship on cosmetic issues.

I just returned from a trip to the mountains of Colorado and was up and down some pretty long and steep grades. When I got gas right before getting home, I noticed both of my front wheels had what appeared to be grease slung out from the small holes in the wheel. Is this something to worry about? Or is it something caused by the changes in altitude, the mountain driving, and such?

Suggestions?

[Sundancer330]

Looks like brake dust on the wheel, give it a good cleaning and you will be fine.