Welcome to Sclero Forums! I'm sorry that you have UCTD and now issues with itching. Many things can cause itching besides, or along with, scleroderma, of course -- including Sjogren's, which can cause severe skin dryness, too.
With my particular scleroderma skin involvement, during the fibrosis stage(s), I experience swelling, itching, burning, plus tingling and other odd pain which feels like my skin is tightening, which it literally is, of course. I'm sure probably everyone is different, but I don't get lucky enough to have *only* itching, even though the itching can be enough to drive me up the wall during an acute phase.
Because itching can be caused by so many things, I strongly recommend that you see your doctor, and perhaps a dermatologist as well.
I also get very dry skin which can cause itching all by itself and is not part of an inflammatory process. For that, I have found relief with several different things. My favorite one is slathering on coconut oil and then taking a lukewarm shower -- with no soap -- and then blotting dry afterwards, and putting on more coconut oil.
If you try this out, and think it over, and really feel that it is likely following the pattern of scleroderma, then I suggest you consult a listed scleroderma expert for evaluation.
Using pure oils (of nearly any sort you like) is good for some of us, because it bypasses a lot of other ingredients that could cause dryness or allergies. Oh, and Bag Balm is good, but it is very thick, so I have only used it at night and then covered up (with gauze or clothing) to avoid staining furniture and bedding.
You can also take a delightful baby oil bath, as mentioned on our Xerosis (Dry Skin) page. It works best when you also play classical music and take it by candlelight -- because that helps reduce the tension caused by that incessant desire to itch!
Another trick I've used is to put a cold pack on my neck. It doesn't stop the itching or relieve the dryness (the other steps are still necessary, especially seeing your doctor), but what is does is interrupt the pain signal so you focus more on the thought of how cold your neck is, and breaks or relieves the mental obsession for a bit. ANY healthy distraction is good!
But, that's also why itching can be more prominent right at bedtime, because there is often little else to think of so it gets the chance to command center-stage. If we let it!