This sort of injury is fairly common in pop rock singing, said Dr. Norman Hogikyan, an associate professor of otolaryngology at the University of Michigan. While the injury is not particularly painful, he said, a singer will notice an almost immediate scratchiness in his or her voice.
"You usually know it's happening vocally because its an abrupt onset of significant hoarseness," said Hogikyan, who said in extreme cases, surgery can be performed to remove the blister to prevent scarring, but rest is usually enough. "It's usually profound enough that it affects one's speaking and singing voice, and as it heals your voice gradually improves."
"This type of problem occurs more often in a pop rock style of singing than in classical singing, because the nature of the voice production puts more wear and tear on the vocal chords," said Hogikyan.