Did you treat your house/carpet for fleas? There could be new fleas jumping on Oscar and the revolution just hasn't had time to kill them..
I wouldn't put anything else on him until 30 days have past..
If you bathe him try rinsing with a mixture of 50/50 vinegar/water. Or you can cut up a lemon and boil it for a few minutes and let the water cool and rinse him with that.. Fleas don't like citrus smell.
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