I just started wearing my retainer again and now have a hard little bump on the right side of my hard pallette--- should i be concerned?

Ask orthodontist: Whenever you are wearing a retainer it should periodically be checked by your orthodontist. The mouth is always changing , if only just a little bit, and requires professional maintainence . It may require a little polishing or adjustment or may be something that requires further study or observation.

Need an adjustment: This sounds like there may be some irritation from your retainer. Your mouth will change over time and the retainer may not be fitting as well as it did initially. Cal your orthodontist and have it checked. It is important to wear you retainer so get it checked.

Yes: Please see your orthodontist or dentist as soon as possibly. Most of the time it is nothing to worry about - the retainer may need adjusting, in some cases, it could be a serious problem. Please see your orthodontist or dentist as soon as possible.

Have it looked at: You should have your dentist take a look at it. It may or may not be related to your retainer.

A bit: Time to return to your orthodontist to have this checked out. No telling if this bump is in response to tissue irritation from the retainer or is from some other cause, so go get it evaluated right away.

Yes: It is probably nothing. Just a pimple or a bone spur. But you should definitely have it checked out by an oral surgeon or dentist.

Yes: It would be best to have your concerns answered by your orthodontist or an orthodontist. Let them check the fit of your retainer and see if it is a source of irritation.

Yes: Any pain/bleeding/swelling should be investigated. May be due to many things, including intermittent compliance.