Persistent perianal abscess in early infancy as a presentation of autoimmune neutropenia.

Autoimmune neutropenia of infancy is a primary, usually self-limiting, antineutrophil autoimmune phenomenon seen in infancy and early childhood. These infants are at a higher risk of infection, and early detection, particularly with the availability of newer therapeutic options such as hematopoietic growth factors, can allow close follow-up and, if needed, treatment. We report two infants with autoimmune neutropenia who presented with a persistent perianal abscess, which has not been documented previously in this population.