Having Sore Which Are Pinkish In Colour. No Redness, No Discharge, No Pain. Having A Purple Scar On Leg, Chest And Abdomen. What Could These Be?

I have been having small sores pop up here and there for months for no reason, starts as a tony red dot then spreads out into a raw sore that resembles a perfectly round light pink cut from a shave lets say. They are light pink with no red and never had puss or drainage. They are flat and not raised. The pain is not bad, but feels like a razor burn pain though. I had one on my leg, that went away and left a tiny pruple scar , weeks later, got 2 on my chest and now there are 3 on my lower stomach area.