Brief Answer:
Regarding your query related to the nipple
Detailed Answer:
Hello. Thank you.
I am Dr kakkar (Dermatologist and Venereologist). I have noted your concern.
The nipple itself is only an exit point for ducts. However the skin of surrounding areola contains plenty of sebaceous glands and hair follicles which can get blocked. The pent up secretions may feel like a cyst. This cyst may subsequently get infected and burst through the nipple.
Regards