Sinus is formed by penetration of skin by ingrowing hair
Leads to foreign body granuloma reaction, sinus perpetuated by repeated bouts of infection
Carcinoma is rare complication of chronic, recurring<unk>  sinus disease
Leads to foreign body granuloma reaction, sinus perpetuated by repeated bouts of infection
Pilonidal cyst
Anal fissure
Hematocele
Anal fistula
Spermatocele
Anal malignancy
Scrotal abscess
Anal tags