Swimming after efudix

Hi,

I've recently  been diagnosed with BCC, both on lower leg and chest. The lesion on my leg is going to be excised after treatment with efudix. 

The lesions on my chest haven't been seen by a dermatologist yet as awaiting appointment, but GP started  me on efudix. I'm now on week 4 of 6.

It's red, crusty and sore   so I take it,it's working. My question is can I go swimming or aquafit  or not ?

Thanks