Dog Constantly Scratching My Dog Is Constantly Scratching Her Flea Bites And Is Tearing Her Fur Out, What Can I Use To Help Her?

My dog is constantly scratching her flea bites and is tearing her fur out, what can I use to help her? - dog constantly scratching

I was more at the forefront of all my dogs, but my dog is allergic to fleas and destruction of their skin itchy bites. His skin is red around the bite and scratch. I do not know what I use to help them.