I just started lifting again 4 days ago for the first time in months. I worked out my biceps mainly. Over the next 2 days, my muscles were sore as expected. However, on the 4th day, i noticed my left bicep swollen, and bigger than it was the day before. The muscle is still sore, and part of my forearm is also swollen a considerable amount. These swellings are only on my left arm, even though I used the same weight/reps/sets for each arm. Is this cause for concern? How should i treat it, and how long will it take to heal?