I don't know if this is a problem but it doesn't hurt to ask. One of the dust caps on my front wheel has a dent in the side, I have no clue how it got there but you can see inside. Is this a problem? Should I get a new one? I know it's such a small thing but it's worth it to ask.

 

if it just a dent no problem if its got a hole get a new one it will let your grease come out and water come in

 

There is a hole in the dust cap? Yes, definitly replace it. The dent is probably from the last person hammering it onto the spindle....mine has a little dent on it.
Parts stores should have them for a few bucks.

 

I didn't make it clear, there is a dent on the side.

 

if there is no hole just a dent just run them they get dented alot of times from servicing the bearings or changing the rotors and beating them back on