Tear trough deformity? Or fat? (Photo)

Hi! I’m 27 and currently live in Japan. My under eyes have bothered me for a long time. Since my teens, I’ve had what I don’t really know what to call other than “bags” under my eyes. Here in Japan, a popular procedure for people who have issues with their under eyes is having fat removed, but I actually don’t know if what I have is fat, a tear trough deformity, or something else entirely. Wary of fillers and fat graft because of the potential for lumpiness, but unsure how to address the issue.