I had my nipple perce 2 years ago and it still had pus coming from it wht can tht be?

Piercings. Take the frigging piercing out. No infection will get better with a foreing body present.
Cyst. Probably a cyst. If cells from the epidermis (the outter layer of skin) get pushed down in the lower layers they can sometimes continue making sweat and oils. If these become trapped they can from a cyst. Unfortunately that may need to be drained and removed....See your doctor.