I have a yellow Bumppo in my mouth .-
itt i touchh pica when it hurts. How I can get rid of it?

Solution:

Most likely it's a canker sore. They are a nuisance but not serious. Visit these sites for suggestions on ways to address them.

http://dentistry.about.com/od/basicdentalcare/f/cankertreatment.htm
http://www.ehow.com/how_3069_treat-canker-sores.html
http://www.buzzle.com/articles/how-to-treat-canker-sores.html

(Via Y!)