TMI!!!!!

Hi everyone. I am sorry if this grosses any of you out... but I need your opinions. 
Last night my bum started hurting. I wiped to see if anything was down there and I found this blister thing. Hurts like crazy. I have been sick and coughing, and I read that a blood vessel can burst if you cough a lot, workout regularly and sit a lot. Which I do. I have an office job 🙄 both my hubby and I were virgins when we got married, and we never do anal, so that rules out an STD. 
Has anyone had one of these? How did you treat it?