Hi there...itching around the anus could be due to inflammation of the surrounding skin. This could be due to increased sweating, friction between the skin folds causing inflammation, that is, intertrigo. It is common among diabetics. Get yourself checked for that. For the itching you can apply sertaconazole cream, twice daily on the surrounding area for two weeks. Orally you can take antihistamines like levicetrizine 5mg once in the night after food for 1 week. If you do not get relief in 1 week, then consult a dermatologist for further evaluation.