A Couple Of Days Ago, My Butt Started To Itch

A couple of days ago, my butt started to itch right at the crack. The next day, my anus started. I didn't scratch thinking it will jus go away. Yesterday, it started to burn. I took a shower and it burned with just the water flowing. Later on when I burned, I went to the restroom to check if there was blood or something, it was just clear fluid.