Toe nail is completely off what should I do?

Kristen

So about 2-3 weeks ago my son slammed a decorative wood covered heater on his toe an I just went to look at his toe last night an the toenail is gone. I am worried about it, but then it don’t seem to be bothering him at all. But should I keep it covered or what should I do? I know it’s gross looking but he won’t let me touch it to take the skin off