Thanks for using Just Answer. I am Dr. SS. I will try my best to help you.
This is INFORMATION only, not a substitute for doctor's visit.
As both of your daughter have eczema
, that can cause bad smell.
Cleaning the area with plain water
after each time use of toilet can help.
Then dry up the area with soft towel each time.
If the symptoms continue, swab test, urine test can be taken.
Then you should discuss with their dermatologist to examine the area whether any treatment would be required.
If you have any query, please feel free to ask to continue conversation by using REPLY button. This will help me to explain further & satisfy you.
PLEASE DO NOT RATE MY ANSWER TILL YOU WANT TO KNOW MORE and rate it as EXCELLENT / GOOD SERVICE when you are satisfied.
Wish them healthy life.