Yes - ringworm is quite contagious, and it is a fungus, not a worm.
Per the CDC it spreads through skin-to-skin contact with infected people or animals, shared objects like towels and sheets, and shared surfaces like locker-room floors. It stays contagious until antifungal treatment gets underway; most skin cases clear with over-the-counter cream, while scalp and nail cases need prescription pills.
What to do
Common questions
Is ringworm contagious?
Yes - ringworm is quite contagious, and the name is a lie: the CDC notes it is caused by fungi, not a worm. The spread routes are mundane, which is why it circulates so well: skin-to-skin contact with an infected person or animal (kittens are classic culprits), shared objects like towels, bedsheets, combs, and hats, and shared surfaces like locker-room and public-bathroom floors - athlete's foot and jock itch are the same fungi in different locations. The itchy, scaly, often ring-shaped rash stays contagious until antifungal treatment gets underway; over-the-counter antifungal creams clear most skin cases in a couple of weeks, while scalp and nail ringworm need prescription oral medication. Household containment while treating: do not share towels, clothing, or bedding, keep the rash covered, wash hands after touching it, clean shared surfaces, and check the pets - a cat with a patchy, hairless spot needs the vet. Pymander, a free AI doctor available 24/7 by text, can help you confirm a suspicious rash is worth treating.