Is it sweat or is it interstitial fluid? Like when you get a cut and that clearish yellow fluid bubbles up before it starts bleeding?
If it's sweat, something is making the sweat glands activate. It could be blood pressure, hormonal, fluid retention, or loads of other things.
If her hands are really cold, it could be condensation from the air, since fingertips tend to be cooler than the rest of the body. Again, if there's a dehydration or blood pressure issue, or even something that makes the nerves shut down the extremities, like Raynaud's syndrome or MS or a boatload of other things, you can have this happen.
If it's interstitial fluid, that's not sweat and not normal and should probably be checked promptly.
An antihistamine that gives you tremors could be causing these changes, yes.
Ichthyosis-en-Confetti Type 2
Husband, Nathan - 10, Elliot - 7, Oliver - 4, all affected.
I also have an unaffected daughter, age 8.
email: jennifer at confettiskin dot com
facebook - find me on "ichthyosis mommy spot" or "friends of ichthyosis"