What do spots on your back mean. they are everywhere. decent size.

Please clarify: The word "spots" has to be the most ambiguous word to describe a problem. I am sorry to report it must be more specific to get a valid response. Can you try something more descriptive?

VisualDX : Hi, it’s hard to say without a picture but there is a great app that may be able to help you get a diagnosis without being seen in person by a dermatologist. The app is called VisualDX and is one of the best, if not the best out there. Many clinicians, including myself, use it. Just snap a photo and it gives you a list of possible diagnoses. Good luck!