Yes, fillers are an option for many people to increase earlobe volume. If my patients really like that look (and fillers are temporary) then we have had success with fat grafting the area for a longer effect and sometime permanent improvement.
Our office repairs earlobes after a traumatic tear of earrings, gauge piercings, or after a facelift in which the earlobes are stretched. Earlobe surgery is composed of several techniques that can either repair torn earlobes (split earlobes) or correct overly redundant earlobe tissue from...
I think that 4.12mm should be a pretty safe size that will likely look like a slightly large piercing after taking the gauges off for a couple of months. This is also a pretty safe size to have the defect closed without much of a scar (5mm).
