If antimicrobial wash kills MRSA, why does using it every day cause MRSA?

Question

I wasn’t sure if this question came under biology or chemistry so I went for chemistry.

I use an antimicrobial wash called Hibiscrub (I think Hiniclens is the US alternative). I am prescribed it for washing in due to an autoimmune condition that affects the skin. I read that antimicrobial wash is a treatment for MRSA as it kills the bacteria.

However my GP just suggested that I no longer wash in it every day as it can cause MRSA infections. So ELI5, how does something that kills MRSA also cause MRSA? Shouldn’t it just cancel itself out?

In: Chemistry

Answer 1

[removed]