While Doing an Assessment of the Perianal Area of a Patient,the

While doing an assessment of the perianal area of a patient,the nurse notices that the pigmentation of anus is darker than surrounding skin,the anal opening is closed,and there is a skin sac that is shiny and blue.The patient mentioned that he has had pain with bowel movements and has noted some spots of blood occasionally.What would this assessment and history be most likely to indicate?

A) Anal fistula
B) Pilonidal cyst
C) Rectal prolapse
D) Thrombosed hemorrhoid