... is that
very few are trained in sexual medicine - as distinct from urology, routine gynaecology or Sexually Transmitted Diseases. It is an entirely different area of competence, and probably
not in the general medical curricula.
Back in the "swinging seventies", there was a flicker of interest, with it being offered as an
optional topic discussed over a week or two as a "summer school", voluntarily by a group of lecturers who considered it sufficiently important, but to what extent this was integrated into the mainstream medical curriculum I am not sure, and speak only for one university.
The consequence is that while they may be aware of the general
mechanics of sex - penis gets erect, penis goes in vagina, semen comes out, etc. - doctors are generally no more cognisant of the finer functional details than the "man in the street", and share similar preconceptions. One of these assumptions is for example, that masturbation is an unimportant, "loser" activity practiced only by pubescent boys and older men unsuccessful in finding a partner. They are thus unsympathetic to the importance of the foreskin in an activity which generally constitutes the
majority of sexual experience.

I suppose this answer is overkill, but it reflects on other discussions here.
The combination cream you were prescribed is quite appropriate but as it is a hybrid, my instructions for its use are necessarily a combination of those for the individual elements. Use it generally under the foreskin while the irritation is present, once that is well controlled for a few days, restrict its application to the tight area of the foreskin and you may then continue its use while you stretch (so as long as you are applying it
only to that tight area and in minimal amount, there is no restriction on how long you use it).
The tightness is part of the
inflammatory process, which takes some time to settle. It is the same process which repairs wounds and pulls them closed again. The betamethasone component will minimise this as you continue to stretch, which it is important to do
now.