Squeezed small bump on neck. awful smelling stuff comes out. keeps coming back. it is not a boil. its under skin no head. is it infected pore.

Sebaceous cyst: This is a typical sebaceous cyst. It's probably not infected now, and is harmless unless and until that happens. But it can be a pretty big deal if infection occurs. It can be treated with minor surgery to prevent recurrent accumulation, drainage, and infection -- probably by a dermatologist. Contact your doctor about a referral.