Itchy, light brown, dry spot on side of breast? (photo)

I am a 30 year old female with a new (6 months ago) brown spot on my left breast. It appeared one day and has remained unchanged since then. No growth or change in appearance. It is exactly where the end of my bra wire hits my skin. I have a bad habit of sleeping in my bra. I'm concerned about melanoma because I tanned for 2 years in my 20's. Please help! Thank you.