Yes, personally I am allergic to enamels but my shrink told me to turn to acrylics and now I need less pills ( aga )
Sorry...
Seriously, I think we sometimes don't practice "safe sex" when it comes to some products ( mek and the like ); superglue can be a problem. Sydney, my little puppy sister is allergic to neoprene glue; every time I open a pot of these, she is gasping for air ( try to explain to your dog that he must not stay with you when you are doing such interesting things) I think it is due to toluene.
A long time ago I made some luthery and I know that you should be wise to use a mask while working ( grinding) on mother of pearl and abalone.
I work in French Social Security and you could be surprised as what can cause "Maladie Professionnelle " ( professonnal disease ) : concrete, but also exotic wood, or fierce animals hair and other bizarre things, so I think someone could reasonably develop a allergy to enamel.