An image included in the man's case report, published Jan. 22 in the journal Cardiovascular Images, shows large yellow bumps appearing to ooze out of the creases in the skin on the palms of his hands.

A bump or sore on the roof of the mouth can result from a burn or injury. It may also be a canker sore or cyst, or it may be a sign of an infection, such as candidiasis or hand, foot, and mouth ...

Piercing bumps tend to appear more quickly and do not grow in size, while keloids take time to form and can continue to grow. A healthcare professional or dermatologist can advise on the best way ...

An image included in the man's case report, published Jan. 22 in the journal Cardiovascular Images, shows large yellow bumps appearing to ooze out of the creases in the skin on the palms of his hands.