For clarity's sake I want to hear about all retraction from just moving of the foreskin at all, up to complete exposure of the glans.
What happened with my ds:
At his 4 month check I wasnt very good at expressing myself especially about genitals so I didnt say anything before the Dr. started the under the diaper check but I was watching him closely just in case since I knew to watch for him trying to retract. He did indeed retract my ds to the point that I saw the tip of ds's glans at which point I put my hand over his and said "please dont do that" and he gave me a look but stopped. Ds had no redness at all after it or any changes that I saw.
The second time when I had taken ds in because he was sick (still dont know what his penis had to do with anything since it was a upper resp. illness) I told the ped., a different one, before he looked under the diaper that I didnt want him to retract (have since learned using that word is a problem since Dr.'s hear it and think full retraction and not moving the foreskin) and he proceeded to again expose the tip of my ds's glans. Again there was no redness and ds has not had problems since then from the retractions. Both where very minor though and no force was used.
So while he was retracted it wasnt a full on forced retraction and he had no issues from it.