How do I know if I have either dust mites or bed bugs?

Zoey P asked:I know I’m getting thebites frommybed. I haveone onmyback,one onmychest,7 onmyhand,2 onmyarm,andtwo onmyhead. I cant see anybugs onmymatress ormyboxspring oranywhere elseintheroom. Sowhatare[...]