As a general rule, it's best to prepare for a dermatologist visit in advance. You can do the following:
Bring a list of the most pressing questions you have for your dermatologist.
You should keep track of any changes in your health.
Find out about your family's medical history. Your dermatologist will be able to make an accurate diagnosis based on this information.
Wear no makeup or nail polish. Your dermatologist may be unable to inspect your skin or nails effectively if you are wearing cosmetics or nail polish.
Ensure that you provide a list of all current medications and supplements that you use or use. The list should include everything from prescription herbal remedies. The dermatologist will also want to know about any past drugs that had adverse effects.
Prepare a list of your known allergies.