Wendy, I looked at the picture, and to me it looks like edema, especially because you say that if you massage it it goes away for a while. Edema is fluid accumulation in the tissues which can be due to various causes. It differs from inflammation in that it's not painful, hot or red. Unless anything has changed since you posted the picture, I would keep an eye on it and see if it improves on its own during the next 3 days or so. If it remains the same, or worsens, I would take him to the vet if I were you.
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