A 20-year-old woman presents with a 3-week history of a pruritic, progressively
enlarging erythematous lesion on one arm. She has a cat and recently
started horseback riding lessons. She is otherwise healthy and takes no
Which of the following is the most likely cause of the lesion?
A. Granuloma annulare.
B. Bacterial cellulitis.
C. Brown recluse spider bite.
What is the most appropriate diagnostic option?
F. Bacterial culture.
G. Fungal culture.
I. Complete blood cell count and liver function tests.
J. Potassium hydroxide (KOH) examination.