Some of us are temporary members, some are permanent.
I don't have melanoma, so I don't have specific advice. I did know someone without salivary glands and they just kept a bottle of water with them at all times.
You are in the right place - you can post anytime, many members will let you PM them (ask first) but I'll at least say you can PM me, and if you want a phone number you can ask for that.
Also, do you have a spouse/significant other or a family member that would have questions? This forum is not restricted to the patients themselves. Everybody is involved.
Best of luck with the PET scan. I've had at least 10 of those, so if you have any questions, I could at least answer those - what to expect, how the process is, etc. Main thing is they inject you with a radioactive marker and you have to be quiet for about 45 minutes in a chair and let it circulate before the scan starts. They're much quicker and easier than MRIs. You might want to bring a music CD with you. Not all of them can pipe music into the scanner, but many can, and if it helps you, bring one and ask. If you're diabetic, your sugars need to be reasonable (<250), but that's about it. They don't want you to work your brain too much while you're resting - preferably no crosswords or internet or whatever. The main reason is they measure the difference in sugar uptakes, and excessive brain activity changes that.
I do have bad jokes. They're not cancer related, though.
- Tab
On edit: Can't help myself. Worst joke I can think of...
Q: Which came first, the chicken or the egg?
Answer: The chicken, because the chicken had to get laid before the egg did.
Let that serve you right for asking about bad jokes. 
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