Is your son 'crying' while he's saying Owie ? Does he say Owie only when he gets a erection ? Does he say Owie when he pees ? Is saying owie all the time ?
The most thing is that his erection is making him feel weird - he can not 'express it as in it feels weird' so he says Owie even if it doesn't hurt or is more unhappy that it woke him up & wants it to go back down so he could get back to sleep
Plus, if your son foreskin is starting to deattach and he says Owie throughout all his erections then it's just normal to feel a bit of soreness during detachment because after all the foreskin is 'fused to the glans & shaft.
Boy I wonder what your husband is learning as a med student as thinking of it to be paraphimosis -which your son does not have - because paraphimosis is when the foreskin is 'trapped behind the "exposed glans' and can be easily treated by a sugar injection into the penis & replace the foreskin back.
Phimosis is normal in children younger than even 18! Because it's congential phimosis or pathlogical phimosis which will 'retract' as in deattach any time by the time they are 18 .
True Phimosis is sometimes caused by acquired phimosis of doctors or ppl forcibly retracting there son's) it can likely be cured with 'stretching techniques , steriod creams etc along with a dorsal slit if stretching & steriod creams don't work.
So don't take your son to a doctor unless he's not peeing okay .
My son used to say owie when he peed -nothing was wrong - he stopped saying owie . I almost took him to the doctor because I thought he had a UTI but I said I would wait it out because it was only when he had 'very big streams of pee he didn't like.
He also used to kid around saying he hurt & only one time I saw the actual time he really hurt -don't know if it was an allergy reaction, if some family member forcibly retracted my son, or just the natural process of deattaching my son whole penis was way way swollen & puffy he was crying . I saw a spot & the end of his foreskin-which looked like smegma -so I assume since with smegma it's the loosening up sign. I gave him a lukewarm bath with no bubbles & diaper free time.
You better start getting your husband educated on the 'right ' foreskin treatment of foreskin we don't need anymore ignorant doctors on the foreskin issue or are too cut happy!
You son definetly "Does Not Need A Circumcision" .