Hedgehog quills turning PURPLE? (PIC)

I purchased my first hedgehog from a college student on craigslist about a month ago. I noticed she had a small purple patch of quills on her back. I thought it was really cool, but possibly a sign of sickness. After research, I found NOTHING about hedgehog quills turning purple. It seems like the patch maybe grew in size since I had her, but I am not positive.



If this is a health issue, I would like to know what is causing the problem. If it is harmless, I wouldn't mind if she turned completely purple. It actually looks quite amazing. Pic below



http://ift.tt/1qH3JjS