Weird rash near breast? More info in comments.

This rash appeared about 3 weeks ago, starting off as a circular purple-greyish bump (lots of bumps) about the size of a penny and which itch a lot, and continues to grow in size. Now it's about the size of a tennis ball and just as itchy, and a lot more rough and scaly. I unconsciously scratch at it and have drawn blood on more than one occasion. I have just been using the anti fungal powder I have mentioned above, but it doesn't seem to be helping. A family member has suggested Luliconazol cream and Itraconazole 200mg once daily, which I have been informed, are both anti fungal medications. Should I go for them? If not fungal, what can this be, and what should I start doing? I am hoping to get an idea before I go see the doctor next week. Thank you in advance.

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