Perianal abscess Infection is the main cause of perianal abscess formation, but the real cause is not well understood by many pediatricians or even pediatric surgeons, even though many surgeons know about incision and drainage, but the most critical cause is ignored: diarrhea. Most perianal abscesses in infants are seen in male infants, and mostly in breast-fed children. Infant girls often have infected preanal fistulas after diarrhea, and perianal abscesses are rare, if not uncommon. The main methods of treatment: 1, incision and drainage; 2, control diarrhea, stop breastfeeding, switch to milk (de-lactose) feeding, oral Similac, probiotics.