All I remember is that it's BL and the doctor is a gynaecologist and the guy comes to him because he thinks he has a growth in his breasts.
Monthly chest maybe?
https://www.mangago.zone/read-manga/monthly_chest/
1st series.
Nothing beats a good slow burn that has healthy characters with good character development!
And they both looks so fucking good. The art and fashion in this manga is just too good. (づ ̄ ³ ̄)づ