I get similar blisters from Vitamin C, especially if it is chewed. I suggest that you ask your ob gyn to recommend a mild swallowing vitamin, preferrably with Ester-C.
Hello,
In my opinion these are canker sores. Canker sores are small shallow ulcers that appear in the mouth and often make eating and talking uncomfortable. They are generally caused by Stress, tissue injury, eating certain foods – including citrus or acidic fruits and vegetables or underlying health condition, such as an impaired immune system; nutritional problems, such as vitamin B-12, zinc, folic acid, or iron deficiency; and gastrointestinal tract disease, such as Celiac disease and Crohn's disease.
Herpes simplex type I blisters or Cold sores or fever blisters are one and the same thing. Unlike canker sores, cold sores are caused by a virus and are extremely contagious. Also, cold sores typically appear outside the mouth – usually, under the nose, around the lips, or under the chin while canker sores occur inside the mouth.
Pain from a canker sore generally lessens in a few days and the sores usually heal without treatment in about a week or two. Avoid spicy or acidic foods during this time.
But if the sores last for more than 3 wks or start spreading then pls consult a dermatologist. In that case herpes simplex I has to be ruled out.
Take care and pls do keep us posted on how you are doing.