"Use an appropriate level of formality."
Questions and disagreements are allowed to happen in effective interactions. However, formality is very important for effectiveness.
"Derm" = skin.
So, when you are going into this field to practice skin diseases and treatment, the word you're looking for is a <u><em>dermatologist. </em></u>
A dermatologist <em>is a special doctor that manages diseases within the skin, hair, and nails. </em>
