vitamin E,variuos lotions and I have track marks on my hands on the top on my right hand that have been ther efor 5 years,altho they look like a place where i was cut with a razor blade or something,the all blended in into on mark..I know what you mean about the wrists and stuff,,i have according to the hospiyal and a dozen nurses very crokked veins in my upper arms elbow region that are hard to put in IV into becuae they go straight and the boom the go of in another direction and the nurse blows a vein...my hands have good veins,altho they are smaller,using a new rig/point /syringe etc... each time is important and injecting into the hands smaller veins means to inject slower than in other places to prevent putting more into there at one time than it can handle,,,i used heroin and other opiates for a number of years 4 to 5 injecting the whole time,an di often used my forearm,wrist,and hands,,juts rotate sites as much as possible,like each injection if you can,,use a new needle everytime especially if injecting into the hand and wrists..actually on my right hand(i can use either hand to hold the syring eand inject with ) I practiced the use of rotating sopts each time and using new needles every shot i did an dhave no noticable track marks there as opposed to my left hand .....