Okay so I was messing with zbrush (for the first time so this is probably my error) I started messing with zspheres and zsketch and then made a polymesh, after some modeling around the head I go to the back and realise some odd edges and folds? over the back.
I made the pic smaller so not to be a loading nuisance but you can still see clearly what’s wrong.

EDIT: thank you Mod for the heads up on image hosting
any Ideas on what went wrong or how to fix?
Thank you in advanced,
Bombshell