Hello...itching around the anus especially in summers is very common. It is usually due to increase sweat leading to intertrigo or sometimes even fungal infections. Try to have regular Baths - 1 or 2 times per day, wipe the area completely dry after having bath, apply some antifungal powder like fluconazole or clotrimazole powder. Even after few days if the problem still persists kindly consult a dermatologist for further evaluation.