For The Last Few Days After Going To The Toilet

For the last few days after going to the toilet to poop I have an annoying anus pain. It fills very sore and quite dry . I have been getting these pains from time to time but never that much. After taking a shower it calms down for a while but after the water in that area has completely dried i get that pain again . I have checked for hemorrhoids but I'm pretty sure its not that . Could it be that the pain comes from the dryness or by sitting for more that 15:00 on the toilet at a time ?
Please answer and thank you