Verbatim response from Perplexity
Yes — if the photo is reviewed by a dermatologist, online dermatology can be fairly reliable for many skin lesions, but it is not a perfect substitute for an in-person exam and biopsy when cancer is suspected. For melanoma/suspicious moles, teledermatology studies show accuracy can be close to in-person care in some settings, but performance varies with image quality, lesion complexity, and the clinician’s experience.[1][4][6]
For moles, the strongest evidence in your results is for dermatologist-led remote review, not automated apps: one study found remote dermoscopy experts were 91% accurate versus 93% for in-person dermatologists, and both methods detected 11 of 13 skin cancers.[1] A Cochrane review also found that a single application using images reviewed by a dermatologist had 98% sensitivity but only 30% specificity, meaning it was good at not missing melanoma but produced many false alarms.[9] Another review found teledermatology for skin cancer had a pooled 94.9% sensitivity and 84.3% specificity for malignant lesions in photographic-image studies.[6]
For rashes, photo-based online diagnosis can be helpful for common conditions, but it is generally less definitive than for a focused mole check because many rashes look similar in photos, and diagnosis often depends on history, texture, distribution, and sometimes lab tests or an in-person exam. Your search results do not directly quantify rash accuracy, so the safest evidence-based answer is that photo review can guide next steps, but it is not reliably diagnostic on its own.[4][6]
A key distinction is who is interpreting the photo:
- Dermatologist review: can be reasonably accurate and useful for triage, second opinions, and deciding whether urgent in-person evaluation is needed.[1][4][9]
- AI/app-only diagnosis: much less reliable overall; one study found only 22.8% top-1 accuracy and 56.4% top-5 accuracy, and a Cochrane review concluded AI apps have a high chance of missing melanomas.[2][9][12]
Practical takeaway: an online dermatologist can often reliably triage a mole or rash from photos, but a photo alone cannot definitively rule out skin cancer or replace biopsy when the lesion is suspicious.[1][6][9] If a mole is changing, bleeding, irregular, or looks very different from your others, the safer path is in-person dermatology even if an online review seems reassuring.[1][9]