**Core Concept**
Erythematous nonblanching bosselated lesions on the face in children are often indicative of impetigo, a superficial bacterial infection caused by Staphylococcus aureus or Streptococcus pyogenes. The condition requires prompt treatment to prevent scarring and potential complications.

**Why the Correct Answer is Right**
Impetigo is typically treated with topical or oral antibiotics. The correct choice is most likely a topical antibiotic cream or ointment, such as mupirocin or fusidic acid, which target the causative bacteria. These treatments work by inhibiting bacterial cell wall synthesis or protein synthesis, respectively.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because antifungal agents, such as clotrimazole, are not effective against bacterial infections like impetigo.
**Option B:** This option is incorrect because corticosteroids, such as hydrocortisone, may exacerbate bacterial infections by suppressing the immune response.
**Option C:** This option is incorrect because antiviral agents, such as acyclovir, are not effective against bacterial infections like impetigo.

**Clinical Pearl / High-Yield Fact**
In children, impetigo often presents as a red, nonblanching, bosselated lesion on the face, and prompt treatment with a topical antibiotic cream or ointment is essential to prevent scarring and potential complications.

**Correct Answer:** D. Mupirocin ointment.