Early symptoms of Paget's disease include itching, pain and burning sensation. These prompt the patients to seek medical advice.
The common symptoms are

Scaly, erythematous, crusty, and thickened plaques on the nipple and areola are seen.

Serosanguinous discharge from the nipple may be present.

Inversion of the nipple.

Bloody discharges from the nipple.

Redness, ulcerations

In approximately 30-40 % of cases of Paget's disease of the breast, there is also a detectable lump in the breast. Lesion size ranges from 3 mm to 15 cm in diameter; the mean size is 2.8 cm in diameter.
Usually only one nipple is affected although rare cases of involvement of both nipples has been seen. Several noncancerous conditions can also mimic the symptoms of Paget's disease of the breast.