Before you jump to sclerotherapy, which would permanently scar over the veins in the backs of the hands (rendering them useless, if, heaven forbid, they should ever in the future be needed for IVs or for injecting life saving medication)s consider the use of a robust HA volumizing filler, which, when injected by an experienced filler injector, can rejuvenate the backs of the hands and mask the unsightly veins that trouble you. You would be wise to seek consultation with an experienced, board certified cosmetic dermatologist. And one more piece of advice: Don't go into any consultation asking for any particular treatment or devices, because more likely than not, and to your later frustration, disappointment and financial loss, you are very likely to get exactly what you asked for. Hope this helps and best of luck.