Anal suddenly itch after had done poop, what the action that can make it back into normal?

Pruritis ani or more: Could you be referring to fissures, fistula, abscess? Sexually transmitted disease (syphilis, gc, hiv, etc.) should be considered. Hemorrhoids & rectal prolapse can appear as an outward bulging. Anal trauma of any kind may cause mechanical injury. Skin eruptions need to be considered. Evaluation is recommended to distinguish serious versus less concerning reasons for your problem before treatment.