It is possible that itching in the anus could be caused by parasites such as pinworms. To confirm this, you can conduct a "scotch tape test" by applying a piece of scotch tape between the buttocks at night to check for the presence of worms. Alternatively, the irritation could be due to poor hygiene. Using unscented wet wipes, a wet washcloth, or a bidet for hygiene, avoiding vigorous rubbing of the area, and applying a protective cream or zinc-based paste may help alleviate the symptoms. If these measures do not improve the condition, it is recommended to consult a doctor for further evaluation.