Pediatric Dermatology in Immunocompromised Patients: Skin Infections, Mucositis, and Measles

Conclusions

• In neutropenic children and other immunocompromised patients, small evolving skin lesions must be re-examined frequently because the correct diagnosis can become apparent only after the eruption progresses.
• Necrotic or edematous lesions in neutropenic patients should prompt early biopsy and broad infectious workup, since fungi, herpesviruses, and bacteria can all present similarly but require very different treatment.
• Disseminated varicella and zoster can occur in children, including vaccinated children, so clinicians should rely on morphology and distribution rather than age alone.
• Angioinvasive molds such as mucormycosis are life-threatening emergencies that require immediate diagnosis, source control, and antifungal therapy to prevent death or organ loss.
• Invasive bacterial infections in neutropenic patients can present as necrotic plaques or around ports and lines, and definitive management often requires culturing the lesion and removing the infected source.
• Zoonotic dermatophytes, especially those associated with guinea pigs and other pets, can cause severe, scarring tinea in children and may be missed if only superficial cultures are obtained.
• Negative surface fungal cultures do not exclude inflammatory tinea, so biopsy is often necessary when the clinical picture remains suspicious.
• Eczema herpeticum should be suspected when clustered punched-out erosions and exuberant crusting are present, and early empiric acyclovir is favored because missing herpes can be dangerous.
• Group A streptococcus can mimic herpes and staph and is increasingly associated with severe pediatric skin disease, so it should remain high on the differential for mixed crusted or pustular eruptions.
• Staphylococcal scalded skin syndrome is usually caused by MSSA, progresses rapidly in infants and young children, and improves when treated early with appropriate antibiotics and close attention to the infection source.
• Bullous impetigo is best recognized as flaccid, coalescing superficial lesions rather than tense bullae, and culture helps guide targeted therapy.
• Tense bullae in children are more likely to represent arthropod reactions than bullous impetigo or staph scalded skin, especially when the child is otherwise well appearing.
• RIME is an infection-triggered mucositis syndrome that is often severe, frequently recurs, and usually needs inpatient care with hydration, pain control, nutrition, and sometimes immunomodulatory therapy.
• When a child has mucositis involving two or more mucosal sites, RIME should be considered even if an infectious trigger is not identified, but HSV must be excluded because herpetic gingivostomatitis can mimic it.
• Measles is re-emerging and can present with relatively subtle but characteristic facial-predominant rash and systemic illness, so unvaccinated patients with fever and rash require immediate isolation and public health response.
• Vaccination remains the most important protection against measles and its long-term complication SSPE, which is fatal and preventable.
• The overall message is that pediatric dermatology consults in hospitalized patients can be lifesaving when clinicians recognize morphology early, biopsy promptly, and treat empirically while confirming the diagnosis.