A bump that bleeds when burst is a blood blister. Usually they are caused by biting the inside of one's cheek, which can happen when one has mouth swelling from allergies.
Strongly suggest burning + blood blister (swelling) = possible allergy, and recommend consulting an Allergist for diagnosis & treatment.
Chronic Lyme, Bart., Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut dysmotility & non-specific inflammation, Lupus, Osteoporosis, etc.; G-Tube
Meds: Flagyl, Domperidone, Zofran, Claritin, Andrographis & other herbs, homeopathy, supplements, etc.