Brian Luong

2 weeks ago | health.com | Wendy Wisner |Brian Luong

Dark spots on your tongue are often not dangerous. Sometimes, they may signal an underlying health condition. SDI Productions / Getty Images Several things may cause dark black spots on the tongue, including a benign condition called hairy tongue, some medications, and some health conditions. Dark spots on the tongue may also be caused by normal human tongue differences, which are common in people with dark skin.