What Causes Shocking Pink Marks In Upper Leg,thumb Nail And Heel That Fades Away?

last week I had a large shocking pink mark on my upper leg that looked like a bruise. It didn't hurt and went away without changing colour in a day or two. Yesterday I had a bright pink mark under my thumb nail but it went away within 12 hours. Today I have a small scocking pink mark on my heel. It is fading already. These are all same shocking pink colour but no reason and no pain. Should I be concerned?