In reply to annawells89:
Try making your own? Liquid chalk is just chalk with a solvent, and depending on the brand that solvent may have something that irritates your skin, or the solvent itself might be doing it, so you could try diferent solvents to see if there's one that works for you and then use that to make the liquid chalk.
There's different grades you can try of isopropil alcohol, rubbing alcohol, ethanol, hell, maybe you could even use hand sanitizer if that works for you which has moisturiser which might not affect the friction. If coming up with a good formula you may even sell it tat the wall make some money
Loads of info around if you search, i.e.