A 6-year-old girl presents with sores on the face that began as a mystery lesion described as a 'cold sore' and recently crusted with honey-colored crusts. What is the most likely diagnosis?

• A. Impetigo
• B. Psoriasis
• C. Atopic dermatitis
• D. Allergic contact dermatitis

Answer: (A)

Impetigo is a superficial bacterial skin infection that in children most often affects the face and presents with vesicles or small pustules that rupture easily, leaving thick, honey-colored (amber) crusts. This crusting pattern is highly characteristic and helps distinguish impetigo from other common pediatric skin conditions. The face involvement and the evolution from a vesicular lesion to a golden crust fit impetigo perfectly, usually caused by Staphylococcus aureus or Streptococcus pyogenes and is highly contagious.

In contrast, herpes simplex lesions (often described as cold sores) typically show grouped vesicles on an erythematous base and do not form the thick honey-colored crusts seen with impetigo. Psoriasis presents as well-demarcated, silvery-scaled plaques; atopic dermatitis shows itchy, eczematous skin with lichenification; and allergic contact dermatitis also features pruritic, inflammatory eczema in the area of contact—none of which fit the honey-colored crusting pattern as well as impetigo.