Tungiasis Treatment & Management

Updated: May 01, 2018
  • Author: Darvin Scott Smith, MD, MSc, DTM&H; Chief Editor: Mark R Wallace, MD, FACP, FIDSA  more...
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Treatment

Approach Considerations

A number of surgical treatment methods are available. The flea can be removed from its cavity with sterile instruments, but this is more difficult when the flea is engorged. The orifice needs to be enlarged, and the entire nodule should be curetted or excised. Following surgical extraction of the flea, thoroughly cleanse and cover the remaining crater with a topical antibiotic cream to prevent secondary infection. [2]

A course of oral antibiotics may be instituted if secondary infection is suspected. Ensure that tetanus prophylaxis is up to date.

Removed parasite shown with needle. Courtesy of Wi Removed parasite shown with needle. Courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Puce_chique_(Tonga_penetrans).jpg).

Consultations and follow-up

Consultations are only rarely indicated and are generally for complications of a secondary infection. Follow-up care confirms a complete resolution of all pain and physical findings. Application of an antibiotic ointment several times a day to the wounds after flea extraction is recommended. [1]

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Topical Treatments

Dimethicone

A two-component dimethicone, available under the brand name NYDA®, has been shown to cause 80%-95% of all embedded sand fleas to lose viability within seven days. It is most effective when applied topically directly to the affected area. Further, dimethicone is considered wholly nontoxic and very safe for extended human use. [52, 53]

Zanzarin

The insect repellant Zanzarin, a lotion consisting of coconut oil, jojoba oil, and aloe vera, was shown to reduce the number of newly embedded fleas and skin lesions, as well as to almost completely reverse the cutaneous pathology, when applied twice daily. [54] In a study in Madagascar, a twice-daily application of Zanzarin was found to be much more effective than the use of closed toed shoes. It is believed that this is because shoes are less financially accessible and often not culturally desired. [54] Zanzarin has now been removed from the market but is made of ingredients that could be accessed locally and so manufactured in areas affected by tungiasis.

Topical antibiotics and petroleum jelly

Topical ivermectin, metrifonate, and thiabendazole have been reported as effective. Occlusive petrolatum suffocates the organism. Twenty-percent salicylated petroleum jelly (Vaseline) applied 12-24 hours in profound infestations caused the death of the fleas and facilitated their manual removal. [6] However, these treatments do not remove the flea from the skin, and they do not result in quick relief from painful lesions. [55, 56]

Other known treatments

Reported topical treatments for tungiasis include cryotherapy and electrodesiccation of the nodules. Application of formaldehyde, chloroform, or dichlorodiphenyltrichloroethane (DDT) to the infested skin has been used, but such treatments are not recommended and may cause patient morbidity.

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Deterrence and Prevention

Prevention of tungiasis centers around using closed shoes in endemic areas. Keeping classroom floors clean and free of organic matter may also be helpful in preventing transmission in crowded endemic areas among vulnerable populations.

However, these two strategies are often more theoretical than practical given the circumstances of transmission in settings of deep poverty. Shoes are rarely worn in areas of potential transmission, indoors or even in classrooms, and shoes may quickly wear out or develop holes, making the wearer vulnerable again.

Studies comparing the use of shoes to twice daily application of the plant-based insect repellant Zanzarin for the prevention of tungiasis show more protective effect with the latter. [12, 57] In areas with a high endemicity of sand fleas, daily application of Zanzarin was found to be very efficacious at preventing tungiasis. [58, 54]

Other control measures include treating infested areas with pesticides and treating infected reservoir hosts. Spraying malathion on the ground in some infested villages was found to significantly reduce the incidence of tungiasis, as was the use of methoprene, an insect growth regulator. A topical aerosol containing chlorfenvinphos 4.8%, dichlorphos 0.75%, and gentian violet 0.145% was found to be highly effective against pig tungiasis. Since pigs are an important reservoir for the fleas, treatment of the domestic pig population could have a large positive effect on tungiasis prevalence. [59]

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