Noticed Brownish And Greyish Dirt Around Rectum Area. Is This A Yeast Infection?

Question: Hello. Lately when I wipe there is a brownish/grayish dirt like substance. I've noticed that sometimes it cakes up around my rectum area...it's not necessarily from my vagina. I really can't tell though and it's there just about everytime I wipe and I have to wipe a good 4x for it to completely go away. I am a very clean person and shower daily. I always always clean up after sex also. Is this a yeast infection??

Hi Doctor XXXXXXX

Thanks for responding to my question. To answer your above questions:

1.I guess you can say it's curdy. It looks like dirt, like something you would have scraped off from under your fingernails. There's a ton of it and it tends to pile up around the rectum area. Yes it's smells sour.

2. No I don't have itching at the site. I did have a little itching just below my vaginal area but that has since ceased.

3. I am curently taking amoxicillian after a root canal. Speaking of which, Ihave had several dental procedures done in the past two months and have had novacane each time. However, this is the only time I am also taking prescribed medication. I also took the OTC Azo pills a couple weeks ago thinking that if this was a possible yeast infection, that it would clear those symptoms right up, but I'm not sure if it did anything or make this worse.

4. I have never had anal sex.

5. I have no other complaints.

6. I do have a history of constipation which dates back to when I was about 8yrs old. Nowadays I don't have those symptoms as badly as I once did, however I do not have a normal bowel movement every day, maybe every 2-3 days. It varies, but I have always been like since infancy.

Please let me know what you think would be the best treatment? I was considering purchasing Monistat 3 or 5. My last 3 or so yeast infections, I cured with a generic cheap Family Dollar brand...perhaps, I should go with the popular brand??