It could be hemorrhoids but regardless if you have a a consistently itchy rectum it could be what is called Pruritus Ani. From my experience after suffering for over 4 years, there is only 1 type of ointment that actually works called PRANICURE. Look it up and try it out cuz it's only $40 for a 3-6 month supply and you can only get it online. Hope this helps!
Hello,
One of the possibilities for your symptoms is external hemorrhoids. Other causes are moisture(due to sweating or frequent washing), friction rub with clothes, the pressure of sitting, chemical irritants like laundry soaps, colognes and scented toilet paper, infections like STD’s and pinworms, anal abrasions and fissures and skin problems such as psoriasis, seborrhea and eczema.
I suggest you to get an evaluation done from a dermatologist as treatment can be planned. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.