A caretaker in a nursing home presents with pruritus of her trunk and extremities. On physical examination, she has several erythematous papules in her finger webs, axillae, umbilicus, and groin areas. Her scalp is clear. Which of the following is the best treatment for this woman?

**Core Concept**
The patient's presentation is consistent with scabies, a parasitic skin infection caused by the mite Sarcoptes scabiei. Scabies is characterized by intense pruritus and a characteristic distribution of lesions in intertriginous areas.

**Why the Correct Answer is Right**
The diagnosis of scabies is confirmed by the presence of mites, eggs, or fecal material in skin scrapings. The treatment of choice for scabies is a topical or oral antiparasitic agent. Permethrin cream is a topical treatment that is applied to the skin, left on for 8-14 hours, and then washed off. It is effective against the mites and their eggs, and is the preferred treatment for scabies due to its safety and efficacy.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a treatment for scabies. While antihistamines may provide symptomatic relief for pruritus, they do not treat the underlying cause of the condition.
* **Option B:** This option is incorrect because it does not address the parasitic nature of scabies. Antibiotics are used to treat bacterial infections, not parasitic infections like scabies.
* **Option D:** This option is incorrect because it does not provide a specific treatment for scabies. While systemic corticosteroids may be used to treat allergic reactions or inflammation, they are not the primary treatment for scabies.

**Clinical Pearl / High-Yield Fact**
Scabies is a highly contagious condition that can be spread through direct skin-to-skin contact with an infected person. It is essential to treat all household members and contacts of the patient at the same time to prevent re-infestation.

**Correct Answer:** C. Permethrin cream applied for 8-14 hours.

✓ Correct Answer: C. Permethrin cream