## **Core Concept**
Cutaneous larva migrans (CLM) is a skin condition caused by the migration of larvae of certain nematodes, most commonly hookworms, into the skin. This condition is characterized by an itchy, serpiginous, or linear skin lesion. The most common species responsible for CLM are hookworms, particularly *Ancylostoma braziliense*.

## **Why the Correct Answer is Right**
The correct answer, *Ancylostoma braziliense*, is a species of hookworm that is commonly found in cats and dogs. When the larvae of this parasite penetrate the skin, usually through a contaminated area, they cause CLM. The larvae attempt to migrate through the skin but are unable to penetrate the basement membrane, leading to the characteristic skin lesions. *Ancylostoma braziliense* is particularly known for causing CLM in humans because it has a high affinity for human skin.

## **Why Each Wrong Option is Incorrect**
- **Option A:** *Toxocara* species are associated with visceral larva migrans and ocular larva migrans, not typically cutaneous larva migrans.
- **Option B:** *Strongyloides stercoralis* can cause a condition known as strongyloidiasis, which includes a skin eruption, but it is not the most common cause of CLM.
- **Option D:** *Trichuris trichiura* (whipworm) primarily causes intestinal infections and is not associated with CLM.

## **Clinical Pearl / High-Yield Fact**
A memorable point for exams is that CLM is often treated with topical or oral albendazole or ivermectin. A classic clinical clue is that the condition is commonly acquired in tropical or subtropical regions, especially after walking barefoot on contaminated soil.

## **Correct Answer:** . *Ancylostoma braziliense*