There are many possible causes of red spots or a rash on the breast, scaly, red , thickened and crusted skin; very dry skin; color changes.
Paget's disease is a rare skin disorder that's often linked to breast cancer in the tissues behind your nipple. It can cause a red, scaly rash.
It usually first appears as a red, scaly rash of the skin that may look like eczema. There might also be some discharge or bleeding from the.