The treatment of hand veins is certainly only a cosmetic issue although I have had a massage therapist whose abnormal veins on her thumb interfered with her work. I have over the last 15 years treated many hand veins with excellent cosmetic results and no functional loss. I use sclerotherapy for the smaller veins and laser ablation for the larger cord like veins. Both forms of treatment work very well, are well tolerated and have high patient satisfaction.
sclerotherapy on the dorsum of the hands is highly effective but takes many months to see dramatic results. your hand function should not be changed in any way besides the treated veins being sensitive afterwards and until their resolution. Cheers