Blood Blister In Mouth Causes Treatment Symptoms And More Sep lima, 2015 doctors and other professionals advise against popping cold sores a popping canker sore —and for good reason—but the temptation will always be there. learn how it . I have a canker sore on my gum line in the back of my mouth and while brushing it bled and appeared to "pop" (pain is less now). should i be worried? dr. diane minich answered 37 years experience family medicine. Home Remedies And Treatments For Canker Sores Dr Raminder Canker sores, also called aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth or at the base of your gums. unlike cold sores, canker sores don't occur on the surface of your lips a popping canker sore and they aren't contagious. they can be painful, however, and can make eating and talking difficult. See full list on mayoclinic. org. Anyone can develop canker sores. but they occur more often in teens and young adults, and they...