I noticed a lump on my daughters back the other evening as she was getting ready for bed and she said it hurt when I pressed it (like a needle pricking her she said). It's under the skin, a hard lump and slightly purple in colour. I took her to the doctor the next day who mentioned a couple of long names he thought it could be (can't remember the exact names!) and said to take a photo with a ruler underneath and come back in 6 weeks for another check. He said he didn't think it was anything to worry about but of course I am worrying as I've been googling and inevitably getting worried about what it could be. Has anyone seen anything like this before on their child?