Medically reviewed by Lauren Schlanger, MD Key Takeaways A ganglion cyst is the most common cause of a lump on your hand or wrist and often feels round or oval. A carpal boss is a hard, bone-like lump ...

Mucous cysts are pseudocysts (cystic structures lacking a true lining) that usually appear on the middle or index finger of the dominant hand; toe involvement is uncommon. Although most mucous cysts ...