Unlucky day again

Today early morning went to a photoshoot with some friends at Bukit Jalil Park. The shoot was ok and everything went well until I think I made a wrong decision to wear three quarter pants to the shoot. Because of that when I knelt on the floor with grass or whatever came in contact with my bare skin on my leg, there seems to be red spots on my right leg. It looks something like this

It seems to be spreading more and more throughout my right leg now. I think I should go and see the doctor now right? Better seek help to stop it before it becomes too late.