Post-Surgery Concerns: Three Months After Anal Fistula Procedure - Surgery

Questions regarding the condition three months after anal fistula surgery?

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Hello, doctor.
I underwent anal fistula surgery at the end of February this year, where the doctor performed a fistulotomy.
During this period, I took about 20 days off work to rest.
I have been taking sitz baths three times a day, and after bowel movements, I rinse and take an additional sitz bath.
After returning to work, I continued with three sitz baths a day (since I usually have bowel movements in the morning at the office).
Recently, around mid-May (about three months post-surgery), I accidentally touched the wound while showering and noticed a small hard lump.
I was worried it might be a recurrence.
The next day, since my original surgeon was unavailable, I went to see a doctor at Chang Gung Memorial Hospital.
During the anoscopy, the doctor pulled out the scope and noted blood on it, indicating that my internal wound had not healed yet.
It was unclear if this meant a recurrence.
The doctor prescribed two types of oral antibiotics and a hemorrhoid suppository (for a total of 14 days, with a follow-up appointment needed for more medication).
He mentioned that this would help solidify the scab from the fistulotomy and prevent stool from seeping in.
However, the day after the anoscopy, I noticed increased swelling at the wound site, and it was painful to walk.
Later, when I checked my underwear at home, I saw some yellow discharge but was unsure if it was from the suppository or something else.
I smelled it and did not detect any foul odor.
After showering, I treated the ruptured wound, which was bleeding slightly but did not show any pus.

A couple of days ago, I returned to the original surgeon at Renai Hospital for a check-up.
He also performed an anoscopy and stated that he did not see any signs of recurrence or new fistula formation.
He advised me to continue taking antibiotics and applying a topical ointment, and to keep doing sitz baths twice a day.
However, today after having a bowel movement at work, I noticed another hard lump at the wound site, which was painful when pressed.
I returned for further evaluation, and the doctor lanced it, but only clear blood came out.
After returning home, I still felt hardness inside, and pressing it was somewhat painful.
I also occasionally experience itching, and I am unsure if this is normal.

I would like to ask, after approximately three months post-fistulotomy, I have seen doctors at Chang Gung and the original surgeon at Renai Hospital, both of whom said there were no signs of a fistula.
However, I am puzzled about the hard lump—could it be scar tissue? Is it normal for it to be painful and occasionally itchy? Can I supplement with zinc and vitamin C to promote faster healing of the internal wound? Additionally, on June 2nd and 3rd, I noticed that after bowel movements, the affected area became very itchy and even swollen.
However, after a sitz bath, the swelling subsided.
When using wet wipes, I noticed a small structure connected to something resembling a tube leading to the anal opening.
Given that it has been three months since the fistulotomy, is it still possible to feel the original fistula? Could the swelling and itching be caused by keloid formation? I appreciate your assistance.
Thank you.

Regarding the hemorrhoid suppository: Yizhi Kang suppository.
Current condition: From late April to mid-May, I had to study at night, so I consumed energy drinks.
I usually have a sensitive gastrointestinal tract and am prone to diarrhea.
Due to studying, I sometimes only get 4.5 to 5 hours of sleep a night.

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Wenwen, 30~39 year old female. Ask Date: 2024/06/03