Hi Doctor,
i am 33 years old male,
10 days ago i started having anal itching, i checked with a mirror to find 2 spots around the anus with raw skin red they didnt hurt to touch or press them, 2 days after the itching became stronger , its a constant itching through the day, there is no pain while having a bowel movement , and the bowel is so normal in shap and color and habbit, the itch may start to be worse sometime after the bowel movement, there is no blood or any discharge.

i visited a colorectal surgion who listened to my complains and then checked the area and did a Digital rectal exam, he touched around the anus and asked if i have any pain (none) and asked me to contract my anus muscle on his finger and push , after that exam he said there is no hemorrhoids,fissures or anything in the rectum and said this is likely a worm infection in the stool , he asked for a stool test which came negative, he prescribed Flagyl and asked me to have 3 salt sitz bath daily, i felt the salt sitz bath made the itching very bad, and i used betadine drops instead , also the flagyl gave me a terrible side effects and i had to stop it.

i really cant understand if the stool test came negative why would i continue havnig a medication for stomach infection,

lately the itching moved more inside the anus , its like something is eating the wall of it, i feel ok when standing or laying down, but the sitting is very bad at times.

i underwent a VAT bullectomy on the left lung 2.5 months ago, and so was on antibiotics for some time, but there is a large gap of time between the last antibiotics and the itching (like 1.5 months)

i was stressed before this happens and i am more stressed now not knowing whats wrong, i am so afraid this could be rectal cancer although the doctor said there is nothing after the DRE and he doesnt seems worried at all

i really need a second opinion , is this normal?