No creams! Clear regular Bacitracin is your best friend. A more affordable substitute is clear regular Neosporin. No pain killer or additives at all. Bend his tail back slightly and try to get a tiny bit inside the vent. Then rub it on the outside. This will ward off any more infection. I have used Bacitracin for everything from stuck eyecaps to the occasional enflamed vent on a breeding male.