It's due to a combination of thinning skin (a common effect of HRT), and not having a sufficiently thick layer of fat below the skin to hide the blood vessels. There's not much you can do about it. Fat redistribution is a misnomer. Fat cells are distributed over the body as determined by your genetics. Like hair follicles, you are allotted a finite number of them for life, and they stay where they're put. You can get rid of fat cells (liposuction) or move them around (fat transfer), but you can't make new fat cells. Fat redistribution is an effect that estrogen has on some people which changes which fat cells the body stores the fatty oil that is created by the body. It cannot store oil in places where fat cells do not exist. I'm one of those girls who haven't experienced fat redistribution even after more than 3 years on HRT. I had to medically transfer fat from my belly and flanks to my butt to achieve a more female body shape. In the process, about 40% of those fat cells perished which is a normal die off rate. As to the matter of blood vessels showing, I, too, have more visible veins in certain areas of my body, but I was fortunate to have been born with thicker than average skin, so the effect has been limited.
