I stay well hydrated, exercise regularly, & eat well. On the back of my hand, there s little fat so my blood vessels stick out & are clearly felt, they can also be seen on part of my palm & my wrist, but not the rest of my body. The skin on my legs & thighs however are very thin or clear because you can clearly see my blood vessels (i ve been like this since I can remember, I am 19). They aren t spider veins though because you can t feel them, only see them.