Rash Between Breasts You How Would You Know The Difference Between Pagets Breast Cancer & Eczema?

How would you know the difference between Pagets breast cancer & eczema? - rash between breasts you

I have a rash, looked like a couple of days in my left breast above the nipple. These are small red bumps not too high, or something to bite and bite, but because I was worried about him, and had a little can be rubbed.