unfortunately this condition can only be diagnosed with a physical exam. we can't tell you what this is over the internet. any number of conditions can cause the symptoms you're describing. it could be something simple like a boil or it could be something more serious like a pilonidal cyst. the only way to know for sure is to make an appointment with your health care provider and get examined. i wish you all the best!
i have a cluster of blisters on the top part of my butt crack. what is it