An 8-year-old boy presents to the nurse practitioner with acute onset of "really itchy" small erythematous plaques, predominantly on the trunk. Approximately 2 weeks ago, the boy was treated for tonsillitis. Which of the following most closely explains his condition?

Choice A reason: Psoriasis vulgaris is the most common form of psoriasis and typically affects the scalp, elbows, knees, and lower back. While it can affect the trunk, it is more chronic and less likely to be triggered by a recent infection. Choice B reason: Generalized pustular psoriasis is a severe and rare form of psoriasis that presents with widespread pustules and systemic symptoms such as fever and malaise. The boy’s presentation lacks pustules and systemic toxicity. Choice C reason: Guttate psoriasis is characterized by small, drop-like erythematous plaques that often appear suddenly on the trunk and proximal extremities. It is commonly triggered by a recent group A Streptococcal infection, such as tonsillitis. This matches the boy’s history and clinical findings. Choice D reason: Inverse psoriasis affects intertriginous areas such as the axillae, groin, and under the breasts. It presents with smooth, shiny lesions and is not typically triggered by streptococcal infections. The trunk distribution and recent tonsillitis make this diagnosis unlikely.