AANP FNP Certification Practice Exam 2025 – Complete Study Resource

Erysipelas is characterized by a clear demarcated border, which helps distinguish it from other types of skin infections. This condition typically presents with well-defined, raised edges and usually affects the superficial layers of the skin, primarily the dermis and upper subcutaneous tissue. The borders of erysipelas lesions are noticeably distinct compared to conditions like cellulitis, which often has less defined borders and involves deeper layers of the skin.

The treatment with dicloxacillin is appropriate because this antibiotic is effective against Streptococcus bacteria, which are commonly responsible for causing erysipelas. Other antibiotics might be used for other conditions, but erythromycin or cephalexin can also be options for milder cases, while dicloxacillin specifically targets the bacteria prevalent in erysipelas.

In summary, the clear demarcation of the borders in erysipelas, coupled with the effectiveness of dicloxacillin against the associated pathogens, makes this the correct answer to the question.