i dont know about the cream-aspect of the equation.

i would go with what is known to work well, on humans and BPs alike:

http://en.wikipedia.org/wiki/Povidone-iodine sold under different brand names including "betadine" and "pyodine".

this stuff is really good for cleaning and disinfecting wounds. its also used to treat scale rot and burns.

its not a cream, i dont think its available as a cream, but you can put it on a cotton swab and clean and disinfect the wound. i dont know if a cream is even a good thing, because all creams contain water as well as oil or fat, and oil or fat will soften the scales as Deborah mentioned.

i got some when i first heared about it, i did not use it on a pet yet, but i use it for myself whenever i have cuts and bruises or other small wounds, it works fine for me.