Hi, I fell over on Friday and grazed my knee, it s been stinging on and off all weekend but tonight feels like I m being pricked with hundreds of pins and the area around the graze feels rather hot , I ve applied savlon which made it sting even more, I m a type 1 diabetic and have slight nerve damage in my feet and legs. Do you think the nerve damage is just magnifying the pain or could it be the start of an infection,