This is most likely due to Anal fissure.
Prefer consuming high fibre diet, avoid straining while passing stools, intake adequate water, use stool softners and local gel applicants containing
calcium dobesilate, and sitz bath twice daily for 20 mins. Continue this treatment for 1 month. If there is no progress, consult a General Surgeon.
Next Steps
There is a possibility that the itching can also be due to a parasitic infection. Consult a General Surgeon for proper examination and further evaluation.
Health Tips
Avoid spicy food, minimise consumption of non vegetarian food.