I have pain in my left forearm and right leg. What is the treatment?

Hello doctor,

I am a 28-year-old male.

1) I have been experiencing pain in my left forearm. It suddenly started, and there was a constant pain in almost the entire forearm. I went to sleep, and it continued to pain, so after a couple of hours, I took Paracetamol. It went away after that. The next day, while doing some work, I put pressure on my forearms, and it started to pain feebly. I saw some swelling after looking at it closely. The portion of the swelling is a bit stiff. If I clench my fists hard enough, the swollen part pains a bit. As far as I remember, I have not had any injury and not doing any stressful work. I am physically inactive. I also had tennis elbow in my right hand about eight months ago due to workouts in the gym. After that I had left the gym too.

2) I have pain in my right leg on the lateral side below and towards the knee. The pain has been there for the past two to three months. It appears when I bend my legs and sit for a long duration and when I stand and stretch my leg. Please help.