Hmmmm, that's a tough one. Advising folks on aches and pains is out of my area, but I can at least share a little experience.
I've felt similar aches in my elbow, which I assume is a little tendinitis. Might be the same for you. I don't really feel it much doing tri work, but i definitely feel it doing any kind of curls.
I'll probably get run out of town for this, but all I've done for it is sort of workout through the pain and it seems to be going away by itself, slowly but surely. I'm not necessarily recommending you do that, especially if it gets any worse for you. But if it stays mild, it might be temporary.
Wait a bit and see what some of the others tell you.