Gaunt face without weight loss, I feel that a fat transfer is the most plausible option? (Photos)

I've noticed a significant change to my appearance over the past few years. I find it abnormal but when I've mentioned it to my Dr they don't seem concerned. Is this just age or could it something more sinister? At the moment I feel that a fat transer is the most plausible option but would welcome other suggestions. Many thanks.