Question For The Bochrim - Leporatic Circumcisions And Shver Rambams

The Rambam says in both hilchos milah and hilchos tumas tzaraas that despite the fact that one is not allowed to remove tzaraas, if the orlah has tzaraas one is allowed to perform the bris because עשה דוחה לא תעשה.

Great.

Problem is that the gemara [Shaabos 132b] says that not removing tzaraas is not just a לא תעשה but and עשה as well so it is really a case of עשה דוחה לא תעשה ועשה which it doesn't. So, bi'kitzur, how does the Ramam shtim with the gemara??

See the Kli Chemdah on Parsha Tazria and the Nachalas Tzvi [chelek beis] as well.