Candidal napkin dermatitis — SCE Dermatology MCQ

Correct answer: D — Topical imidazole cream with barrier care

The correct answer is D, topical imidazole cream with barrier care. A bright red, well-demarcated rash that involves the skin flexures/folds with satellite papules and pustules at the margin is the classic description of candidal napkin dermatitis, distinguishing it from simple irritant nappy rash which spares the flexures. Current UK guidance recommends a topical imidazole (such as clotrimazole or miconazole) alongside continued barrier measures once candida is suspected clinically, without needing to stop barrier cream use altogether. This child is systemically well (afebrile, feeding), so no systemic antifungal or antibiotic is required; topical therapy is sufficient and appropriate first-line management. Why the other options are wrong: B. Potent topical corticosteroid under occlusion: potent steroids are not used in nappy rash even without infection, and occlusion increases absorption and risk of skin thinning and worsening candidal proliferation; only mild hydrocortisone for short courses is ever considered, and never under occlusion in this age group. E. Oral flucloxacillin as first-line therapy: flucloxacillin targets staphylococcal/bacterial infection, not candida, and there are no systemic features (fever, spreading cellulitis) to justify oral antibiotics here. A. Permethrin cream to the whole family: permethrin treats scabies, which presents with burrows and widespread itchy papules, not confined to the napkin area with satellite pustules. C. Reassurance with water cleansing alone: barrier care alone has already failed, and satellite pustules confirm candidal superinfection requiring targeted antifungal treatment, not simple hygiene measures. Key point: satellite papules/pustules with flexural involvement in nappy rash indicate candidal superinfection, treated with a topical imidazole plus continued barrier care, not steroids, antibiotics, or antiparasitics.

Reference: NICE Clinical Knowledge Summaries, Nappy rash: Scenario Management, cks.nice.org.uk/topics/nappy-rash/management/management/