My dog has scabs on her skin. What can i do?

My dog is medium sized (no particulat tace, she's a mix), with blonde fluffy hair (we've had it trimmed because of the summer) and i've noticed that she's got scabs all over her back and tail under all the fur she has. Me and my family have considered taking her to the vet but we never thought it was serious. Anything i can do? Btw, i'm sure she doesn't have fleas if that helps. Thanks!