Somebody came here today looking for "amputee lubricant." So glad you asked!
When you are first fit with a suction socket, you will need to use some kind of goo to ease entry of your stump into first the "check" socket and then your prosthetic's socket, both of which will have been cast to fit your stump intimately. I have hypersensitive skin which is allergic to at least one ingredient in almost every commonly recommended product of this type, especially alcohol in any form whatsoever, so I had to go looking for alternatives. Fortunately, my dear friend Karen was with me the day I was first cast for a check socket, and she had lived in the town where my prosthetist's office is, so she knew where to take me: to the natural grocery store, A Market. This is a small store with friendly, helpful staff and a deep selection of skin care products, and here I found the perfect product for my needs, Burt's Bees Milk & Honey Body Lotion.
This product is very slippery, with just a little bit going a long way. In fact, it's a bit more slippery than is quite ideal for beginners, so if you use too much you might find yourself sloshing around in your socket and not staying in quite as well as you'd like, and that can be daunting and a little dangerous. Too much liquid in the socket even for experienced wearers can also cause the dreaded socket fart. This particular fluid also sometimes leaves a yellow stain on your skin, which can make you appear slightly jaundiced, and stains white cloth yellow, which can make your panties look like you peed yourself. However, it smells lovely, like coconut, oranges, and honey, and the staining is not permanent. Just wash your hands. Or, for fabric, apply a little liquid detergent (I like Seventh Generation, myself) directly to the stain, let it sit for a bit, and then wash, and it should come right out of any natural fiber, even in cold water. The best news of all is, of course, that you won't have to use it forever. Putting the socket on gets easier with time, and you will develop better techniques than greasing up. Honest, you will.
One thing that may not ease up, though, is chafing. And while this lotion is a lovely moisturizer which I've also found quite helpful against dry skin in the depths of winter, it really can't form any kind of protective barrier between skin and anything tougher than a gust of wind. You will need to find other tools to combat this, and like me, you may find that you will need a variety of options, something for every kind of circumstance. I have my girdle for the winter. For spring and fall, and on and off throughout the summer, I have high tech plastic bandages. For much of this summer, though, I've relied on something else, something new, at least to me: BodyGlide.
My boyfriend found this stuff at EMS. Knowing of my constant, chronic difficulties with chafing and pinching, he picked me up a tube so I could try it out. (What a mensch, eh?) It works great! It's completely natural, with no animal or petroleum products and no alcohol or scent. It's just a couple different forms of vegetable-based fat and some glycerine, plus aloe and Vitamin E. However, it has a smooth, waxy texture which creates a barrier -- even when you sweat. It has no perceptible weight or thickness. You can wear it in hot weather without consequence. It takes hours to sweat/wear it all off, and once you have, it's easy to reapply. You can also apply it right to dampish skin straight out of the shower, whereas I have to blow-dry my crotch and upper thighs before I can get fresh bandages to stick.
Sometimes I still have to apply a bandage over a spot at the top of my inner thigh which just wears out from constant rubbing and pressure. This is the result of putting weight on a part of my skin that was never meant to bear weight and will never callous sufficiently to protect itself, and so it happens even using BodyGlide all day for several days in a row, with nothing else between me and the plastic socket. However, um, in case you missed that, I only get cripplingly chafed after wearing nothing but BodyGlide between my skin and my prosthetic all day, several days in a row -- not several minutes or several hours, but several days -- provided, of course, I've been wearing shorts and not big, thick pants with vicious pinching seams. Against that kind of assault, I still need girdles and bandages if I'm planning to walk any distance at all.
I have found, as you might, that having multiple strategies for each problem is the best of all possible circumstances. If one thing doesn't work in one situation, you can reach for something else. Almost two years out from my amputation, all the things mentioned in this post -- Burt's Bees Milk & Honey Body Lotion, high tech bandages, a good girdle, and BodyGlide -- are in my tool kit and get plenty of use. I recommend them all, the first for getting into a check socket or a new socket (and for nourishing sensitive dry skin pretty much everywhere on your body), and the other three to combat chafing year-round and help you live a life as active as you desire.