Thank you for the query.
If you do not have pain when passing stool, fissure not so obvious as the main symptom of it is strong pain. Skin rashes and large intestines problem (rectum
is a part of it) sound more like Crohn`s disease. Moreover hard treatable UTIs can be caused by rectum and urinary bladder fistula
(can be due to Crohn disease). As you can see there is much more that should be diagnosed.
I suggest you to start with urine culture and if E.Coli
or Bacteroides will be positive, colonoscopy
should be performed.
Hope this will help.