I tried using colgate on my pimple and it left me with a burn. The area is all dried up. What should I do?

Wash off toothpaste. And leave it alone. Do not use products for purposes for which they are not intended. Toothpaste is for teeth.
Leave it alone. Let it heal. Leave it alone. And, never do something like this again. Colgate is for brushing teeth, not for pimples or skin troubles.