This link helps with the question
Melanoma, the varieties and stages of disease, treatment
Among the choices given, the statement that best describes the mental disorders is that they are illnesses that can affect the person's emotions, behaviors, and thoughts. The answer to this item is letter C. Some of the most common mental disorder that have been greatly affecting human lives are depression, bipolar disorder, dementia, etc.
Seeing as how a dentist practices dentistry, I believe the answer would be a dentist. Hope this helps!
That sounds to me like you may have just gotten a blister. They come back a little crusty sometimes. I’d recommend going to the dermatologist, there are a lot of great ways to clear up acne with special medical care! There are also some helpful over the counter creams and medications. It doesn’t sound like any kind of skin condition, but you would be able to confirm or deny that if you went to the dermatologist.
Hope that helped! :)