Cutaneous larva migrans

It is a serpiginous (snake-shaped) skin rash caused by the subcutaneous migration of parasitic larvae.

The larvae penetrate the skin when it comes into contact with sand or litter contaminated with cat and dog faeces in tropical and subtropical countries.

An itchy red spot appears at the site of contact and within 2-3 days thread-like, filiform, tortuous, sinuous, reddened tracks can be seen progressing a few millimetres per day in the subcutaneous tissue. They cause severe itching and scaling of the skin.

It is diagnosed by clinical history and physical examination.

It usually clears up without treatment after 2-8 weeks, although specific medications may be prescribed.