This patient also has extensive oral erosions. He tells you his only new medication is dicloxacillin, which he is taking for impetigo. How many days prior to development of the pictured eruption did this patient most likely begin taking dicloxacillin?
A. Hours-2 days
B. 7-21 days
C. 21-56 days
D. 60-90 days
E. >180 days