Of course foreskin retraction is mentioned in medical literature and pleasingly enough, in old medical illustrations as well. It is something every physician should be knowledgeable about.
Here on the forum we're medfetishists and enjoy this kind of thing, especially the imagining and telling and reading. But in real life situations there is little need to expect doctors to go to any lengths to examine the foreskins of their male patients, unless either the patients have specific complaints or perhaps unless the doctors themselves have an obsession of a personal nature themselves, much like we have. But that's a bit of a no-no professionally speaking, right?
The vast majority of males in the world are uncircumcised and get by with minimal attention to that part of their anatomy. American doctors might perhaps be somewhat more curious about foreskins, or less knowledgeable about what to do with them - just use a wash and dry cycle (ha ha) - and perhaps be far too prone to prescribe circumcision as a cure-all and first-tier treatment.
But otherwise I'd see this as a cultural difference thing. For some odd reason American society by the mid 20th century adopted this cultural-religious practice and turned it into a semi-requirement of male national identity (the clean-cut American boy image - which, as I mistakenly thought when young, does not refer to a hair style for boys ... ha ha).
For medfetishists, this is all a very thankful development, as it allows the fantasizing of situations of detailed penile/foreskin examination, of forced circumcision and male-to-male contact and other situations, all of which allows the exploration of feelings and desires that are not always overly evident.