Hello, I’m 17 years old and I’ve just spotted a light brown small circle (but bigger than an average freckle) on my big toe located on the inner left side (opposite the second toe). It doesn’t cause me any discomfort and is symmetrical in size. There’s a small darker shade of brown in almost the centre of the circle but I wouldn’t have noticed it had my sister not pointed it out to me. I was wondering if I should be concerned and whether or not I should visit my GP about it? What could it be?