A skin cancer screening is a quick, painless visual exam that typically takes about 20 minutes. Your dermatologist will look at your skin from head to toe, checking for moles or spots that show signs of cancer or precancer. If anything looks suspicious, they may take a small tissue sample called a biopsy right then and there. Here’s what the whole process looks like, from preparation to results.
How to Prepare Before Your Appointment
A little prep goes a long way toward making sure your dermatologist can see everything clearly. Skip makeup on the day of your screening. Many skin cancers on the face, particularly basal and squamous cell types, are subtle enough that even light foundation can hide them. Come bare-faced with just sunscreen if you’d like.
Remove nail polish and artificial nails before your appointment. Skin cancer can develop under your nails, and polish makes it impossible for your dermatologist to spot discoloration. If you do show up with polish on, your doctor will ask whether you’ve noticed any changes under your nail beds, but a direct look is always better.
Your scalp will also be examined, so avoid heavy hairspray or scalp powders that make it harder to part through your hair. Bring a brush or comb to fix your hair afterward. Beyond that, there’s nothing special you need to do. You don’t need to fast, stop medications, or avoid showering. Just wear something easy to change out of.
What Happens During the Exam
You’ll be asked to remove your clothing and put on a medical gown. Your dermatologist will then systematically examine your skin from your scalp down to the soles of your feet, including areas you might not think of: between your toes, behind your ears, and along your hairline. The exam itself is entirely visual and doesn’t involve any needles or discomfort.
Your doctor may use a bright light and a handheld magnifying instrument called a dermatoscope. This device lets them see structures beneath the surface of the skin that aren’t visible to the naked eye, like pigment patterns, tiny blood vessels, and color variations within a mole. It’s pressed gently against the skin and is completely painless. The dermatoscope is one of the most important tools in catching melanoma early, because it reveals internal patterns that distinguish harmless moles from potentially dangerous ones.
Throughout the exam, your dermatologist is mentally running through a checklist for each spot they examine. The most widely used framework is the ABCDE rule:
- Asymmetry: one half of the mole doesn’t match the other
- Border: edges that are ragged, notched, or blurred rather than smooth
- Color: uneven shading with mixtures of brown, black, tan, white, red, or blue
- Diameter: larger than about 6 millimeters (roughly the size of a pencil eraser), though melanomas can be smaller
- Evolving: any change in size, shape, or color over recent weeks or months
If everything looks normal, you’ll get dressed and be on your way. The whole appointment, including check-in and any questions, usually wraps up within 20 minutes.
What Happens If Something Looks Suspicious
If your dermatologist spots something concerning, they’ll likely photograph it for your medical record and recommend a biopsy. This sounds more intimidating than it is. The area is cleaned, numbed with a small injection of local anesthetic (similar to what a dentist uses), and then a tiny sample of skin is removed. You’ll feel the pinch of the numbing shot, but the biopsy itself is painless.
There are a few different techniques your doctor might use depending on the type and location of the spot. A shave biopsy uses a small blade to scoop a thin layer from the surface and is the most common approach for spots that don’t look like melanoma. A punch biopsy uses a small circular tool (typically 2 to 8 millimeters wide) to take a deeper, full-thickness sample, which is useful when the doctor needs to see what’s happening in the lower layers of skin. For spots that may be melanoma, an excisional biopsy removes the entire lesion along with a margin of surrounding skin, because the full depth of the growth matters for accurate staging.
After the biopsy, you’ll get a small bandage and simple wound care instructions. Most biopsy sites heal within one to two weeks. Scarring is generally minimal, especially for shave and punch biopsies.
When You’ll Get Results
Your skin sample goes to a pathology lab where it’s examined under a microscope. Results typically come back within a few days, though more specialized testing can take longer. Your dermatologist’s office will usually call or message you with the findings. If the biopsy shows cancer or precancer, they’ll schedule a follow-up to discuss next steps and treatment options. If the results are benign, you may simply get a notification that no further action is needed.
How Often to Get Screened
For most people, an annual skin cancer screening is sufficient. Your dermatologist may recommend more frequent visits if you have a personal or family history of skin cancer, a large number of moles, a history of severe sunburns, or very fair skin. Between appointments, keeping track of any new or changing spots on your own body helps your doctor catch problems early. Some dermatologists will give you a body map or take baseline photos so changes are easier to track year over year.
Cost and Insurance Coverage
Coverage for skin cancer screenings varies more than you might expect. The Affordable Care Act requires most private insurers and Medicare to cover certain preventive cancer screenings without out-of-pocket costs, but skin exams aren’t uniformly included in the same way that breast or colorectal screenings are. Whether your visit is billed as a “preventive screening” or a “diagnostic visit” (meaning your doctor is evaluating a specific spot you came in about) significantly affects what your insurance will pay.
Medicare covers many cancer screening tests in full, though you may still face a copay related to the office visit itself. Medicaid coverage varies by state. If you’re unsure, call your insurance company before the appointment and ask specifically whether a preventive skin exam is covered and whether a biopsy performed during that visit would change your cost. Plans that were in place before the ACA was passed (known as grandfathered plans) may not offer the same coverage as newer plans, so it’s worth checking even if you’ve had your insurance for a long time.