Hello, About 2 weeks ago, I stretched and felt a burning sensation behind my ear and down my neck. A few days later I felt slight pain in my shoulder/trapezius area - then worked an 8 hour shift with weights. After that, my deltoid/shoulder has been swollen. Aside, when I press it feels like a ball that moves - and i recently had a semi-risky sexual encounter (protected sex, unprotected oral). The left side of my neck/face has a slight fatigue/pain. Is this all musclular, and just needs to heal? Or should I be worried about my lymph nodes? Could that be a sign of swelling instead of a pulled trapezius?