A full skin check takes about fifteen minutes. The dermatologist examines the skin from scalp to soles, including the parts you cannot easily see yourself. The goal is to find changes early, when treatment is simplest.
What the dermatologist looks for
A useful shorthand for what makes a spot worth a closer look is the ABCDE rule:
- A — asymmetry: one half does not match the other.
- B — border: irregular, notched, or blurred.
- C — color: more than one shade, or uneven.
- D — diameter: larger than 6mm, roughly the size of a pencil eraser.
- E — evolving: changing in size, shape, color, or symptoms over time.
A spot that fits one of these is not necessarily a problem. A spot that fits several is worth a closer look with a dermatoscope.
What to expect during the visit
The dermatologist uses a hand-held lighted instrument called a dermatoscope to look at spots more closely. If a spot still looks concerning, a small sample may be taken for the lab. The sample is taken with local anesthetic, and the wound usually heals in a week or two.
What to look for at home
Check your skin every three months. Pay attention to places you forget — the back of your legs, the soles of your feet, between your toes, your scalp, and your back. Use a mirror or ask a partner to help.
A useful pattern: photograph any spot you are watching, with a ruler next to it for scale. Compare the photos over time. Changes that are slow and visible only in photos are easier to act on than changes you remember differently.
When to come in sooner
A new spot that grows quickly, a spot that bleeds without trauma, or a spot that itches or hurts for more than two weeks is a reason to book an appointment outside your usual schedule.
How to prepare
Remove nail polish from fingers and toes so the nail beds can be seen. Come without makeup if the dermatologist will examine your face. Wear loose clothing that is easy to remove and put back on.
This article is general information. If you have a spot that concerns you, contact your dermatologist’s office directly — most clinics keep a small number of urgent slots open each week.