Hi,
It i possible that it is a group of scar tissue that has built up from the bite. This is quite normal though if it starts getting bigger or there is draining you will need to get him into see his doctor. If it is scar tissue there is no reason or alarm as it will go away on it's own.
It is possible that it is cellulites which will need to be treated by antibiotics. Since this was a injury from a bite I would recommend that he be seen by his doctor to determine which it is.
Walter
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