Spots on leg

Makinzee

Does anyone know what could be causing these spots? They don’t itch, the one on my knee like exploded and now I have a sore there. A couple in the back of my leg did that as well. They don’t itch. I’ve never had them before. its been a little less than a week since I first noticed it. I plan on going to the dr about it soon, I just wanna know what y’all think it could be!