You have retracted nipple ?permanent or temporary you have to judge. Your nipple connected with the rest of the breast lobules which are called as Lactiferous ducts otherwise called as milk ducts.
You have extreme soreness in your right breast underneath your nipple area and surrounding area. Very hard and hurts when touched. The veins looks engorged. along with retraction of nipple.
The pain redness
explains it is an inflammatory process which needs antibiotic and anti infammatory treatment. As there is no discharge from the nipple your milk duct might have got blocked. This is noway connected with your periods. Mammography
is a must to rule out other causes. Consult a gynecologist/general surgeon
for treatment. Otherwise no major problem.