Last week my left armpit became very sore almost like I had pulled muscle. Then two days later I was feeling around and found two very small swolen lympth nodes.

As of today, I can only find one very small lympth node in my left armpit but now another small lympth node is forming under my right armpit and came about in the same way as my left. Started out feeling like I had pulled a muscle and then appeared a day later.

Both are still tender to the touch and are no bigger than the size of a M and M. No other symptoms. Not any more tired than I always am, no fever, no chills, no fatigue.

What could this be from? I am starting to get a little concerned only that it has gone to my right armpit now. Any help is appreciated.