Infantile perianal pyramidal protrusion.
BACKGROUND
The number of reported cases of infantile perianal eruption has been increasing. However, infantile pyramidal protrusion located in the midline anterior to the anus has apparently been reported mainly as acrochordons or skinfolds.


METHODS
Fifteen infants (14 girls and 1 boy) had a pyramidal protrusion located only in the midline anterior to the anus. Histological examination revealed acanthosis in the epidermis, marked edema in the upper dermis, and mild infiltrates in the dermis. The patients had been brought to the hospital because of swelling of the protrusion. However, all protrusions showed reduction without any treatment.


CONCLUSIONS
Infantile pyramidal protrusion located only in the midline anterior to the anus should be distinguished from acrochordons or skinfolds based on the characteristic clinical features.
Kayashima
K
K
Department of Dermatology, Kumamoto University School of Medicine, Japan.
Kitoh
M
M
Ono
T
T
D001004:Anus Diseases / Q000473:pathology*; D002675:Child, Preschool; D004487:Edema / Q000473:pathology; D004848:Epithelium / Q000473:pathology; D004912:Erythrocytes / Q000473:pathology; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009504:Neutrophils / Q000473:pathology; D010502:Perineum / Q000473:pathology; D012871:Skin Diseases / Q000473:pathology*