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We have seen neither his face or back.

Yes do your homework.

Yes pay attention to the guidance given by a quality doctor.
Do note well that doctors get it right most of the time.

In this case her recommendation was very...

Yep she thinks you have an infected razor burn (I can read minds).

I suspect she is correct about the infection but uneducated
with regard to the wealth of quality shaving soaps and more
that...