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The best thing to do is to find out what this mass is: an infection needing antibiotics, a benign lesion that is going to go away on its own, a tumor that needs to be removed. FNA, fine needle aspiration is the best way to do that. A small fine needle is inserted to get cells from the mass to examine under a microscope. Once we know what this is, we know the best treatment. If it starts to bleed or ooze, if it starts to bother him, if it is growing, I would get it checked out.
Hope this goes through! Let me know what else I can answer.
I hope you were able to see my answer. Please let me know how he is doing.