I am a 17 year old male. For the past 6 months, I have noticed an unusual smell of fecal matter around my genital area. It is not noticeable to other people but I can smell it myself sometimes. I went to take a look down there and I noticed that there are yellow patches around my anus. I have taken a picture for those who wish to help diagnose. The link is below. There is no pain, itching, oozing or anything. Just this noticeable smell and the yellow patches.