I have never known a child to be on Miralax for so long.... since birth.
I do not believe... that Miralax... is supposed to be used for that many years....
Look up "Encopresis." It is an INvoluntary leaking of poop.... and it then means this is a medical problem. Not "him." People with this medical problem... DO have 'skid marks' on their underwear. They cannot... help it.
You said... this JUST stared occurring in him... ...
Also, Per his RASH... he may have a Yeast infection. That is why, the creams you tried do NOT work. You need to use a Yeast cream... the kind women use. Per our Pediatrician... she said to use one that contains "Clortimazole" in it.
I feel so bad for your son.... it is obviously an involuntary... thing.
Maybe try explaining to his Teacher...that he has a medical issue... so that the Teacher does not wrongly.... "judge" your son. That would be so... negative for him.
AND have extra clothing/underwear for him, at school.
THIS is perfectly reasonable.
When my Daughter was in Kinder... she had pee accidents. The Teacher, NEVER brought attention to it, she told me in private, she never embarrassed by daughter... and she told me to bring in extra clothing/underwear for her. And that she as a Teacher would make sure/help her change her clothing.... if need be.
As far as using diapers at night... he is NORMAL. Day time pottying has NOTHING to do with night time. Nigh time dryness... is something that is not BIOLOGICALLY attained.. even up until 7 years old. And is normal... and per Pediatricians.
My daughter, was already 5 years old and still wearing diapers at night. Even at 7 years old, she still had, pee accidents at night. NO biggie.
I just used waterproof bed pads under her that I got from Amazon... and that's it.
I am surprised... your Pediatrician has not mentioned that his rashes... could be a yeast infection and prescribe the proper cream for it. And that the Nystatin... has been overly used... for 'years.' This is an antibiotic cream... which is not meant to be used for 'years.' It can then cause.... secondary problems. For example.. it becoming resistant... to the medication.
all the best,
Susan