The app screens for STDs that result in physical symptoms such as syphilis, herpes and genital warts.
Twenty-five percent of the images screened are actually STDs, the company says. Often the images show something else entirely, such as an infected hair follicle.
"There are a lot of worried people out there," says the company's founder, Alexander Borve. "People actually think they have an infection and they don't."
The service is available internationally. The screenings are not definitive -- they only provide potential diagnoses. The results include information about what the user may be experiencing and recommendations for treatment, including when to see a dermatologist or visit an STD clinic to have the diagnosis verified.
"We're not a diagnostic service. We're not trying to substitute the doctor relationship," Borve says. "We're getting the right patient at the right time to the right level of health care."