Is it obligatory to wash inside earring holes while performing ghusl?
It is not fardh to wash the parts of the body that are hard and troublesome to wash such as eyes and closed earring holes (Ibn Abidin, Radd al-Muhtar, I, 285-286). It is needed to move earrings and tight rings during ghusl. In this subject, one should not exaggerate by having waswasa (extreme anxiety or misgivings), rubbing the ear holes will be enough to have a valid ghusl (Ibn Abidin, Radd al-Muhtar, I, 288-289).
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS