Second injury

My poor knee! I have no idea how this happened. I literally woke up early Thursday morning to it hurting. The doctor said he "thinks" it's an infection inside my knee. If it doesn't go away in 3 days, I have to go see a specialist. I have to take 3 pills 3 times a day and 1 pill twice a day for 3 days. There is redness all around my knee, and I recently discovered a darker spot right on my knee cap. Praying that it goes away soon!