I have a bump on my back that hurts like a pimple but it's not. It's red, about the size of a dime and hurts to touch.?

Go be seen . By a doctor.
Probably an infected cyst that may require antibiotics first to calm it down and then excision .
Infected cyst. It is probably an infected cyst. A hot compress 3 times a day can help bring it to a head. If it is soft and feels like there is fluid in it, you should see a dermatologist to have it opened.