AI Skin Analysis vs a Dermatologist: What Each One Is For

AI skin analysis and a dermatologist do different jobs. An app such as Pori is for cosmetic tracking: scoring hydration, texture, tone and visible aging from a selfie and showing whether your routine is helping over weeks. A dermatologist is for diagnosis and treatment: moles, rashes, severe or scarring acne, anything painful or changing, and prescription medicines. Use the app between visits, never instead of one.

We make Pori, so we've put it first; here's what each option does well. Below is what the research says about AI next to dermatologists, a side-by-side table, a clear list of signs that mean you should book an appointment, and how to use both together.

What is AI skin analysis actually good for?

It's good at grading visible, cosmetic signs consistently and at showing change over time. In a study of selfies from 1,041 women in the US, an automated system graded seven facial signs and 50 dermatologists graded the same images. For five of the signs, the automated grades were strongly correlated with the dermatologists' assessments (r of 0.75 or higher). Cheek pores were moderately correlated, and pigmentation, especially on the darkest skin tones, was only weakly correlated. Most of the authors work for L'Oréal or its ModiFace unit, which built the system, so read it as a promising result from an interested party.

The study also found that dermatologists disagreed with each other by a fraction of a grading unit, and that the algorithm was in many cases more consistent than the panel. That consistency is the real strength of an app. It doesn't get tired, and it measures your cheek the same way on a Monday as on a Friday. For routine feedback, that's what you need:

• tracking whether a new moisturizer, retinoid or sunscreen habit changes texture and tone over several weeks;
• keeping a dated photo record you'd never remember to take otherwise;
• spotting links between your skin and sleep, stress or your cycle;
• getting general guidance on routine order and ingredients.

For a plain-language look at how the scans work, see how AI skin analysis works.

Can AI replace a dermatologist?

No. Even the strongest research results come from narrow, controlled tasks. A widely cited 2017 Nature paper trained a neural network on 129,450 clinical images and found that it matched 21 board-certified dermatologists at two classification tasks on biopsy-proven images. The same paper points out that skin cancer diagnosis starts with a visual screening and may go on to dermoscopy, a biopsy and examination of the tissue under a microscope. A photo can only support the first step.

Consumer apps that try to judge cancer risk perform less well in practice. A systematic review in the BMJ found only nine studies of such apps, mostly small and of poor quality. One app had 0% sensitivity for melanoma in a study of 15 lesions; another reached 80% sensitivity and 78% specificity for malignant or premalignant lesions. The reviewers concluded that current apps cannot be relied on to detect all cases of melanoma or other skin cancers.

Skin tone is another limit. When Stanford researchers tested leading dermatology AI models on a curated set of images with diverse skin tones, the models showed substantial limitations, particularly on dark skin tones and uncommon diseases. Dermatologists also performed worse on those images, and fine-tuning the models on diverse images closed the gap. We cover this in more depth in does AI skin analysis work on darker skin tones.

Where regulators have approved AI for skin cancer, it's a tool for doctors. In January 2024 the FDA authorized DermaSensor, a prescription device that helps physicians who are not dermatologists decide whether to refer a patient. It is for patients aged 40 and over, only for lesions already considered suspicious, and the FDA states it is not a screening tool and should not be used as the sole basis for a diagnosis.

How do AI skin analysis and a dermatologist compare side by side?

The useful split is simple: the app watches, the doctor decides. For apps aimed at single moles, see our roundup of mole checking apps and what they can't tell you.

When should I see a dermatologist instead of using an app?

See a doctor for anything new, changing, painful, bleeding or spreading. A scan score going up or down tells you nothing about these signs, so don't wait for an app to flag them.

Moles and spots

The American Academy of Dermatology (AAD) advises consulting a dermatologist immediately if a mole or pigmented spot shows any of the ABCDE warning signs:

• A, asymmetry: one half of the spot is unlike the other.
• B, border: irregular, scalloped or poorly defined edges.
• C, color: varying colors from one area to the next.
• D, diameter: melanomas are usually larger than 6 millimeters, about the size of a pencil eraser, though they can be smaller.
• E, evolving: the spot looks different from the rest or is changing in size, shape or color.

The AAD also says to get checked for any new spot, a spot that looks different from your others, or one that itches or bleeds.

Rashes

According to the AAD, a rash needs medical attention if it covers most of your body, blisters or turns into open sores, comes with fever or illness, spreads rapidly, is painful, or involves the eyes, lips, mouth or genital skin. Signs of infection such as pus, pain, swelling or warmth also mean it needs care. Trouble breathing or swallowing, or swelling of the eyes or lips, can be an emergency: get help immediately.

Acne and other ongoing conditions

• Acne that is deep, painful, leaving scars, or not improving with over-the-counter treatment. See cystic acne: what helps and when to see a dermatologist.
• Redness, flushing, flaking or patches that keep coming back, which could be rosacea, eczema or seborrheic dermatitis and are easier to manage with a diagnosis.
• Dark patches that spread or don't fade with sunscreen, which may need a dermatologist to tell melasma from other causes.
• Any sore that doesn't heal.

What does a dermatologist do that an app can't?

Examine, test and treat. A dermatologist can look at your whole skin, including places you can't photograph well, use a dermatoscope to see structures beneath the surface, and take a biopsy when a spot needs a definite answer. A selfie app sees one angle of your face under whatever light you happen to have.

Treatment is the other half. Many effective options, from prescription retinoids to oral medicines, need a prescriber who can weigh your history and monitor side effects. Isotretinoin is a clear example. The AAD describes it as a prescription medication for severe acne that comes with enrollment in the iPLEDGE program, a follow-up visit every 30 days to get the next prescription, and required pregnancy tests before and during treatment for anyone who can become pregnant. No app can or should take over that kind of care.

How can I use an AI skin app and a dermatologist together?

Use the app to collect evidence and the appointment to act on it. A few habits make that work:

1. Scan consistently. Same light, same time of day, bare face. That turns weeks of scans into a record a doctor can actually look at.
2. Log what you change. Note new products, medicines, sleep and stress so patterns show up next to the photos.
3. Bring the history. Photos of a flare at its worst help when your skin looks calm on appointment day.
4. Track prescribed treatment. After a dermatologist starts a treatment, regular scans show whether texture and tone improve, which helps at follow-ups.
5. Never use a good score to rule something out. A high overall score says nothing about a single changing mole.

If you want to know how far to trust the numbers themselves, read is AI skin analysis accurate.

Where does Pori fit?

Pori sits on the tracking side of that split. A selfie gives you an overall skin score from 0 to 100 in about 10 seconds, with separate scores for Hydration & Moisture, Pores & Texture, Pigmentation & Tone, Anti-aging & Elasticity and Overall health, plus a skin-age estimate. It builds a morning and evening routine, keeps a skin diary for sleep, water, stress and diet, and shows before-and-after comparisons and progress charts. Pro adds an ingredient scanner that flags each ingredient as beneficial, use with caution or avoid for your skin type using fixed rules, and an AI chat that draws on your scan history.

Pori is not a medical device. It doesn't diagnose, treat or check moles, so take anything on the list above to a dermatologist.