Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I cannot see the issue in question and I'm not sure what is meant by "shinny". However, I will assume that you are referring to a shoot coming from the base of the tree. This will indicate that the grafted rootball specimen is "waking up". It can be a sign of stress that your tree is experiencing, but it can just be a sign of a vigorous root ball, as well. This really depends on the health of the rest of the tree.
Since the tree is producing fruit, I will assume that these "suckers" are a normal part of your rootball. They will stop as the tree ages. Just continue to remove them as you see them.
These articles will help you with citrus care: