Hi thanks for writing here.Dry irritated skin around anal fissures is suggestive of perianal dermatitis.It has number of underlying causes such as bacterial and fungal infections,worm infestations,eczema ,stress releated,etc.You may also get constant itching if you have piles or fissures as secretions oozing out irritate the skin.,Ruling out underlying cause is important in such cases,so it will be better you consult a dermatologist.In any cases it is always important to keep area clean,wash with water and a toilet soap instead of cloth use running water after toilet ,also keep area dry ,otherwise it will lead to fungal growth.You can just take tab.atarax at night and apply steroid antifungal combination for temporary relief.