hi i had gone through your query and understand your concerns. i would come up with two most possibilities to fit your condition .these include 1.first possibility is,APTHOUS MOUTH possible causes include; -Stress or tissue injury is thought to be the cause of simple mouth ulcers. -Certain foods, including citrus or acidic fruits and vegetables (such as lemons, oranges, pineapples, apples, figs, tomatoes and strawberries), can trigger a mouth ulcer or make the problem worse. - nutritional problems, such as vitamin B-12, zinc, folic acid, or iron deficiency and gastrointestinal tract disease, such as Coeliac disease and Crohn s disease are the other causes 2.second possibility for armpit lump is,FURUNCULOSIS ; possible causes -maceration of skin,dusty,dirty environment,and ingestion of too many carbohydrates may predispose to furunculosis. treatment option; i advise you taking Homeopathic medicines gives safe and permanent cure for your complaints consult your local homeopathic physician for correct diagnosis of the case and remedy to fit your complaints I hope this is helpful for you, thank you