As for this unnamed woman-her doctors performed surgery to remove the worm and she made a "full recovery", according to the journal. A Russian woman was left quite surprised after she noticed a small lump under her left eye. Five days later, it migrated to above her left eye and then after 10 days, it crawled to her upper lip.
Inside of the new host, the larvae is able to finish its evolution into an adult worm.
The worm turned out to be a relatively harmless parasite that she contracted from a mosquito bite. Unsurprisingly, she went to the doctor - but not before taking some selfies to document the lump's movement.
The lumps had been there for about two weeks.
There are a number of medical conditions that can cause bumps and lumps in the skin of your face, but this turned out to be none of those.
The patient reportedly told physicians she'd traveled outside Moscow to rural Russian Federation, where she'd been the victim of a lot of mosquito bites.
The 32-year-old then went to see an eye doctor who noticed the lump was moving around the upper left eyelid, according to the report in the New England Journal of Medicine.
Generally, though, the worm causes "no serious harm to humans (but certainly to the dogs)", Kurtzhals said. However, luckily, these worms can nearly never reproduce in humans, and all symptoms usually disappear quickly if the worm is removed - so if you've noticed any odd lumps moving around your body after a mosquito bite, you should probably get to a doctor.
His research showed that between June 1997 and June 2013, almost 1,300 cases of dirofilariasis were found in Russian Federation and Belarus, usually among women who visited rural areas-which is how the unnamed woman in this case study is thought to have contracted the infection. The doctors used local anaesthesia, gripped onto the bulge and pulled out the parasite using forceps. And human cases have been on the rise in recent years. Cases have been reported around the globe, particularly in parts of Europe, Asia and Africa.
Medical experts agree this parasite is just another reason to do what you can to protect yourself from mosquito bites.