Kate McKinnon reveals her struggle with geographic tongue—what to know

Actress Kate McKinnon has spoken openly about her diagnosis of geographic tongue. The condition, which affects between 1% and 3% of people, causes unusual patches to form on the tongue's surface. While it may look alarming, doctors confirm it is harmless and not linked to cancer.

Geographic tongue occurs when small bumps on the tongue, called papillae, shed in certain areas. This leaves smooth, red patches that can look inflamed or irregular. The appearance of these patches is often the clearest sign of the condition.

The exact cause remains unknown, but possible triggers include stress, allergies, hormonal changes, or a past COVID-19 infection. It also appears more frequently in people with psoriasis, vitamin deficiencies, Type 1 diabetes, or a fissured tongue.

There is no cure, and the patches may disappear on their own before reappearing later. For those experiencing discomfort—especially when eating spicy or acidic foods—topical anaesthetics can provide temporary relief.

Despite its unusual appearance, geographic tongue does not require treatment unless symptoms cause discomfort. Doctors reassure patients that the condition is benign and unrelated to serious illnesses. For now, managing flare-ups focuses on avoiding irritants and using pain relief when needed.