What are basic medical, no latex or powder containing lab gloves made of?
most gloves like that are made of vinyl if one melted on your hand from heat, then the worst thing you have to worry about is a burn if you burned an entire vinyl glove in the right conditions you could produce a small amount of dioxin, but not anything to worry about unless you do it regularly and even then, breathing the fumes would be a more likely source of entry than through the skin