| Cause | Age at presentation | Diagnostic features | 
| omphalitis | Neonatal | Purulent discharge Periumbilical skin inflammation | 
| Umbilical granuloma | Neonatal | Homogenous granuloma with discharge | 
| Umbilical hernia ulceration | Neonatal | Skin breakdown and purulent discharge (with or without faeculent material) | 
| Patent urachus, urachal cyst | Any age | Urine in discharge (in patent urachus), presence of second lumen in umbilical cord, purulent discharge, and mass | 
| Patent omphalomesenteric duct remnants | Neonatal to early childhood | Serosanguinous, feculent, or bilous discharge, presence of second lumen in umbilical cord | 
Reference:
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