Two new types of ringworm that have made their way to the U.S. aren’t the type you might be familiar with.

Generally, ringworm — which for the record, is caused by a fungus, rather than a worm — has plagued school showers and other areas athletes gather. Typically, one would realize they had “jock itch,” be treated and then be done with it.

But the two new versions of ringworm that have made their way to the U.S. this year are more contagious, spread through sexual contact, resist treatment, and are trickier to diagnose.

That’s why doctors are being asked to watch out for them, even if it means asking patients some pointed, personal questions.

One of the versions being studied can look more like eczema lesions rather than the neat circles people more often associated with ringworm. That mistaken identity can mean the fungus goes without proper treatment for longer than it ordinarily would.

The other skin condition doctors are being asked to look for is widespread in India and is now being seen globally. First confirmed in the United States last year, the infection causes itchy and contagious rashes, but often resists terbinafine [tur-been-ah-fin], the antifungal most often used as treatment.

The infection can be cured, but not quickly. Patients may need to take oral antifungal therapy medicine for up to three months or until the lesions have fully resolved.

And while the rash is present, those infected must avoid skin-to-skin contact with others to avoid spreading the infection.

Scientists are working in the U.S. and internationally, hoping to expand research efforts and track emerging cases.

For now, rates in the U.S. remain low.