I am 18 years old. My anus has been itchy for a few days. On the second day after this started, the itching was so severe that I had to excuse myself for visiting the bathroom. Once I got there, I noticed a yellowish-brown discharge on my underwear. It was very difficult for me to pass stool the night before. After returning from work, I used the bathroom again, but it was difficult to pass stool. I noticed nothing on my underwear afterward, but my anus is still itchy. Today, my private parts started to hurt, and the area around them started to itch.
Please help me find a solution to this problem.