1. Heat Rash These rashes may appear throughout the body, including the breasts. Some of the reasons behind it are tight or very heavy clothes, exposure to heat, and sweating.

2. Psoriasis  This condition involves your skin breaking out into flaky scales. Although breasts are not the most common area where this condition occurs, the scales may appear anywhere in the body.

3. Post-Surgical Symptoms A recent breast surgery can lead to itchiness, as a part of the healing process. This is because surgeries for breast implants and breast augmentation stretches the skin.