What Causes Lump And Itchiness With Flaky Skin On Breast?

Hi I am a young 17 year old female. Since about August/September of this year I noticed my nipple on one of my breasts started to have a red scaly rash. I thought nothing of it and it then developed into a scaly crusty type rash, the skin is flaky and often sticks to my bra hurting me when I remove my bra. My breast and nipple is very very itchy and if the flaky skin is pulled off when removing my bra it then bleeds. I have been given cream for eczema from my gp and this hasnt worked. I have also found a small lump in the same breast. I have looked online and found out it could be pagets disease, do you think it is??? please help me.