My parrot fish has this thing on its right side and it looks like a zit should I be concerned ?
I'm not certain but it may be "ick" which can be treated. A pet store that sells fish should be able to help you. It's a fairly common problem.
I think it's worth checking up by a veterinary doctor because we are not sure what it is or what it might develop to if it is not treated. Check with a pet store or a veterinary doctor to help identify the problem and also help in the treatment.