This is called as constipation with anal fissure tight anal sphincter one needs to avoid constipation by all means, if you increase roughage in your diet reduce your milk intake and increase your vegetable and salad intake in your diet the fibre component automatically goes up which avoids constipation,  also you need to take lot of water during the day for getting the anal resistance while passing the bore well I will suggest you following creams to apply Proctosedyl point Nitrogesic oint per anal use just few min before sitting on toilet.