I don't think it's a rub situation. I think it's some retained shed. Not a big concern unless it's retained eye caps. I don't think that's what you have here. A little time in a shed box should clean up any leftover skin. Here's a link to a thread about a cheap shed box.
All that being said he looks great. You did good.
http://www.thamnophis.com/forum/husb...-shed-box.html