This time, one on my tongue bleeds when I try to carefully brush away the white film that coats my tongue whenever these breakouts occur. Kim Loos Dr. Kimberly A. Loos practices general dentistry in San Jose, California. She is also a clinical instructor at University of Pacific School of Dentistry and an editor for Dentistry On-Line. They are fairly common. Most studies suggest they occur in about 20 to 60 percent of the population.
Females tend to be affected more than males.
If both parents had RAU, it appears their children are more likely to have the affliction. Prevalence appears to be higher in professional people and those in higher socioeconomic groups. Both minor and major RAUs occur in similar areas in the oral cavity. They are common everywhere except on the gums, hard palate, and outer lips. Herpetiform RAUs may also occur on the palate and gum tissue.