Dent on my left thigh, Vaccine complication. Is it fixable? (Photo)

I have a dent on my left thigh from a DPT vaccine during my infancy. It looks like a slight elevation about 4 fingers width with a slight indention when relaxed sitting down . But if standing and not relaxed width is the same but the indention gets deeper about quarter inch (unsure) on the center part. I feel fat/muscle on the area when I press down. I've included picture here. Hoping you could help me.