Roundworm—Ancylostoma braziliense, the common dog/cat hookworm, causes Cutaneous Larval Migrans, but other species in the roundworm family Ancylostoma, Uncinaria, Bunostomum (cattle hookworm), Gnathostoma (dog, cat and pig roundworm), Capillaria (rodent, dog, cat and poultry whipworm) and Stongyloides can also cause cutaneous larval migrans. Picture of an Ancylostoma egg in a fecal floatation:

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Ancylostoma eggs

Picture reference: https://www.pet-informed-veterinary-advice-online.com/fecal-float.html

Symptoms include itchy, red serpentine lesions and secondary bacterial infections (from scratching). The soil and sandy beaches get contaminated with feces from infected dogs or cats so sunbathers, fishermen, hunters, gardeners, construction workers, pest exterminators, children and anyone with skin, but one human can pass it to another human as well or from one spot to another area on the same body. Here are some pictures of cutaneous larval migrans in a human:

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Cutaneous larval migrans

Picture reference: https://www.okawvetclinic.com/site/view/124892_

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Treatment includes Thibendazole, sedatives and anti-itch products. I’ve used clove flea shampoo with success for some of these cases. The trick is to worm stray animals and/or keep them off the local beaches. Duck poop also harbors a parasite that may contaminate swimming holes (Swimmer’s itch).

Roundworm—Ancylostoma duodenale or Necator americanus causes Hookworm Disease. Symptoms include abdominal pain, iron-deficiency anemia, heart problems and stunted growth, but there also may be no symptoms. Eggs are discarded into the feces of animals or humans which hatch in the soil. These infective larvae can now penetrate the skin (usually through bare feet), and get into the lungs through the lymph and blood system. Here are some hookworms inside the mucosa of an intestine. See how tiny they are?

Picture Reference: https://www.okawvetclinic.com/site/view/WormsandOtherInternalParasites.pml#Hookworms

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Hookworm adult