Our expert says:
Two males together should not be a problem if they are raised together, as long as there are no females around to get them all worked up. In the unlikely event that fighting does occur, neutering the submissive male should sort out the problem. The transparent bumps are most likely due to a viral infection, and should pass by themselves. However, it the rats seem itchy, a mite infestation is possible, and you should have it treated at your vet (usually 3 injections at 10 day intervals).
Dr Willemien van Wyk
Bird and exotic animal veterinarian
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