From CDC. gov:
"The chigoe flea, Tunga penetrans. The flea is also referred to as the jigger, nigua, chica, pico, pique or suthi."
The JIGGER
The NIGUA
Female chigoe fleas burrow into the skin, usually between the toes or under the toenails, where they swell to the size of a pea and remain embedded for several weeks, laying eggs that are released into the environment. This process can lead to painful nodules, inflammation, and secondary infections, including tetanus or gangrene, especially in areas with poor sanitation.
There are no drugs currently available with proven effectiveness. Surgical extraction still remains the treatment of choice in patients with a low parasite load, such as tourists returning from endemic areas. The only approach to reduce tungiasis-associated morbidity in heavily affected individuals is the application of a repellent to prevent the penetration of sand fleas.
That sounds pretty bad.