I have sores in my mouth and a blister on my finger that getslarger and smaller. i am not sure if it is a dentist or a doctor i should see.

It : It would be best to see a dermatologist, who can do an examination, and viral culture, or skin biopsy. These complaints could be herpes simplex, and these tests could help find the correct diagnosis.

Doctor: Call your doctor & make an appointment....He will decide what is the next step toward improvement..

See your dentist.: Dentists are well trained in all areas of the mouth. Consider having them take a look at your condition.

Canker sores: It sounds like the two are unrelated. Canker sores, also known as mouth ulcers or mouth blisters, usually heal on its own in about a week or two. If the sores continue to persist, or are large or painful, visit your dentist. Depending on the nature and severity of the sore, dentists prescribe antimicrobial mouth rinses, corticosteroid ointments, or a prescription to reduce the pain and irritation.