I have a few piercings in my ears and had two in my lobes for a while. They have never rubbed when riding, but if they are rubbing it may be an idea to cover them in some way when riding as the rubbing will slow down the healing?
I have double in one ear and also pierced half way up where it becomes cartilage then on other ear I have the top of my ear. That’s the only one I had an issue with when it was healing.