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Based on the history, oral herpes would present with a history of oral-to-oral contact or oral-to-genital contact with someone with an active herpes infection. Canker sores generally have idiopathic and multifactorial causes such as local trauma, emotional or physiologic stress, allergy or sensitivity, or nutritional deficiencies Based on the physical exam, ...

Mucoceles can rupture. Usually that will resolve them though. If it persists, it needs a doctor most likely. You can find more details on that here and explanation of what a doctor would do for one that isn't resolving after rupture. http://www.steadyhealth.com/medical-answers/oral-lesions-oral-mucocele-and-canker-sores

Firstly, I would be reluctant to ascribe those symptoms (recurrent oral canker sores) to acid reflux. In very severe reflux acid can make its way up the oesophagus and can cause chemical burns to the throat and mouth, but there would also be other related symptoms, like nausea, indigestion, heartburn, persistent coughing (caused by acid irritating the larynx)...