A full body scan at the dermatologist is a head-to-toe visual examination of your skin, designed to catch skin cancer and precancerous spots early. The exam typically takes about 20 minutes and involves your dermatologist systematically checking every area of your body, including places you’d never think to look yourself.
What Happens During the Exam
You’ll change into a medical gown, and your dermatologist will work through your entire skin surface in a methodical order. That includes your scalp, behind your ears, between your fingers and toes, the soles of your feet, and your buttocks. Nothing gets skipped. The goal is to identify any mole, spot, or lesion that looks abnormal or has changed over time.
For most of the exam, your dermatologist is using their trained eye. But when a spot needs a closer look, they’ll pull out a dermatoscope, a handheld magnifying instrument with a built-in light. This tool lets them see structures beneath the surface of the skin that are invisible to the naked eye. It reveals patterns in pigment, blood vessel arrangements, and tissue architecture that help distinguish a harmless mole from something concerning. Dermoscopy improves the accuracy of skin cancer detection and helps dermatologists catch melanomas at thinner, earlier stages compared to a visual check alone. It also reduces unnecessary biopsies on spots that turn out to be benign.
What Your Dermatologist Is Looking For
Your dermatologist evaluates spots using a framework sometimes called the ABCDE criteria: asymmetry, border irregularity, color variation, diameter of 6 millimeters or larger, and evolution (any change over time). A perfectly round, evenly colored mole is less concerning than one with jagged edges, multiple shades of brown or black, or one that’s recently grown or changed shape.
Through the dermatoscope, different skin cancers reveal different telltale patterns. Melanomas may show disorganized pigment networks, irregular dark dots, or streaks radiating outward from the edge of a lesion. Basal cell carcinomas tend to have branching blood vessels, blue-grey clusters, or small erosions on the surface. Your dermatologist is trained to recognize these patterns instantly, which is why professional screening catches things that self-checks miss.
How to Prepare
Skip the makeup and remove your nail polish before your appointment. Skin cancer can develop under fingernails and toenails, and polish makes those areas impossible to examine. Come with clean, bare skin so nothing obscures your dermatologist’s view. If you have a spot that concerns you, make a mental note of where it is so you can point it out during the exam.
If it’s your first visit, expect the appointment to run a bit longer. Your dermatologist will ask about your medical history, family history of skin cancer, sunburn history, and other risk factors before starting the physical exam.
What Happens If Something Looks Suspicious
If your dermatologist finds a spot that needs further evaluation, they’ll likely recommend a biopsy, which means removing a small sample of skin to send to a lab. This can happen the same day in most cases. There are a few common types:
- Shave biopsy: A thin layer is scraped from the top of the skin using a small blade. This works well for raised spots and usually doesn’t require stitches.
- Punch biopsy: A small circular cutting tool removes a deeper core of skin, including layers below the surface. This may need a stitch or two to close.
- Excisional biopsy: The entire suspicious area is cut out along with a margin of normal skin around it. This requires stitches and is used when the dermatologist wants to remove the whole lesion at once.
Results typically come back within one to two weeks. Most biopsied spots turn out to be benign.
Total Body Photography for High-Risk Patients
Some dermatology practices offer a more advanced version of skin monitoring called total body photography. This uses a system of multiple cameras to photograph your entire skin surface, creating a detailed baseline record of every mole and spot on your body. At future visits, new images are compared against the baseline to detect even subtle changes.
This technology is generally reserved for people at the highest risk for melanoma: those with more than 100 moles, multiple atypical moles, a personal history of melanoma, a strong family history of the disease, or known genetic mutations that increase melanoma risk. It’s not part of a standard screening, but your dermatologist may recommend it if your risk profile warrants closer surveillance.
How Often You Need One
There are no rigid national guidelines dictating exactly how often every adult should get a full body skin exam. Recommendations depend heavily on your individual risk. For people at higher risk due to fair skin, a history of blistering sunburns, family history of skin cancer, or a large number of moles, an annual skin exam is the standard recommendation. People with a personal history of skin cancer may need checks every six months or even more frequently, depending on their situation.
If you have darker skin and no significant risk factors, your dermatologist can help you determine an appropriate schedule. Regardless of how often you go in for professional screening, regular self-checks at home between appointments help you spot changes early and bring them to your dermatologist’s attention.