Afebrile Which Of The Following Is The Most Likely Diagnosis?

Which of the following is the most likely diagnosis? - afebrile

A 31-year-old homosexual presented complaining of pain during defecation. He denies symptoms of diarrhea, abdominal pain or fever had. Six months earlier, he developed diarrhea and travelers to Mexico. On examination, has no fever and has an abdominal examination unremarkable. In investigating the peri-anal, a group of five ulcers clustered in the vicinity of the anus and extends into the anal canal. Sigmoidoscopy showed normal rectosigmoid mucosa. Which of the following is the most likely diagnosis?