A nine year-old male child presents with hair loss for the past two weeks, that started abruptly. The family efers a similar presentation when he was six, but not as severe as now, successfully treated. Denies other signs and symptoms, family history of alopecia, autoimmune diseases or comorbidities. No psychological factors were related to the alopecia.

Question:
Based on the clinical picture and images, which of the following is the most likely diagnosis?