Seven-time Grammy Award winner John Mayer has cancelled his 2012 tour. The singer and guitar player previously had a condition called granuloma, and it has returned. Due to the condition, Mayer has been forced to go on a hiatus from performing. While this won't set back the release of Mayer's new album, Born and Raised, it will set back the tour to promote it. 

Granuloma is a benign growth that is generally a result from irritation or drama, says VoiceMedicine.com. Mayer took to his blog to describe his condition, saying that granuloma forms and continues to snowball because it's in a spot where the vocal cords hit together. There's no way to really give it a chance to heal without a good stretch of time and some pretty intensive treatment.

What causes granuloma?

According to VoiceMedicine.com, the limited soft tissue that cushions the larynx makes the vocal cords more prone to trauma.  The trauma occurs from the impact of the vocal folds coming together during the vocal process. Habitual loud-talking or throat clearing can both cause granuloma, said VoiceMedicine.com.

What does granuloma looks like?

Granuloma is generally red or pale, according to VoiceMedicine.com. The condition has the ability to grow, and usually looks like a mound on the tissue.

What is the treatment for granuloma?

Eating behavior, diet change and anti-acid medication are all helpful in treating granuloma. VoiceMedicine.com also states that treatment can include voice therapy to treat bad behaviors such as throat clearing or loud-talking. Granulomas should shrink and disappear with time and proper treatment. Surgery is also another option, but used as a last resort due to the fact that granulomas have the ability to grow back.