Twice in the last several weeks I have had a sudden, splotchy, red patch (looks similar to a hickey), that is also warm and itchy, appear on my one breast. It's under the skin and is not just a surface irritation, and has been at two different locations. It resolves itself within a day or two. I've recently had my yearly mammogram, followed by an ultrasound to check what turned out to be cysts, nothing of concern. I've not yet hit menopause. Searching online I found information about IBC, and worried it might be the beginning stages of that. Although that's unlikely, I'm wondering what it may be from. Any ideas?