Secondary serratia marcescens infection in tinea capitis in children with kerion manifestation

Serratia marcescens is a Gram-negative bacillus belonging to the Enterobacteriaceae family. Skin infections caused by S. marcescens are sporadic and are usually found in immunocompromised adults. Kerion is an inflammatory subtype of tinea capitis. In this case, we reported a 5-year-old child diagnosed with tinea capitis caused by Microsporum audouinii, which gave a clinical picture of a kerion type with abscesses and crusts. A pus culture examination found colonies of S. marcescens. Tinea capitis with S. marcescens secondary infection, and kerion appearance yields satisfactory therapeutic results.