Sometimes my anus gets very itchy then it kinda stings afterwords?

Be Gentle: Having itching around the anal area is often due to over cleansing, over wiping, and applying too many chemicals to the area. Avoid scented toilet paper. Don't use soap or lotion on the area. Instead, you can use a cleanser designed for the area called Balneol. And I know how hard this is, but don't scratch. Foods can also be the problem - commonly red wine, tobacco, tomatoes, citrus, beer.

Make sure: that you clean the area after each bowel movement. If it persists, it could be a fungal skin infection or even an intestinal parasite, so you need to see a doctor.