Verbatim response from Perplexity
Yes—an online dermatologist can often reliably triage a mole or rash from photos, but photos alone are not enough for a definitive diagnosis in every case.[1][4][5] For moles suspicious for melanoma, teledermatology performed by a dermatologist has shown high sensitivity in some studies, while automated apps are much less reliable and can miss cancers.[1][10][11]
For moles, the evidence is strongest for store-and-forward teledermatology: a dermatologist reviewing images remotely had 98% sensitivity in a Cochrane review, though specificity was low, meaning it could flag many benign lesions as concerning.[1] In contrast, automated smartphone apps had highly variable performance and in some cases missed a substantial number of melanomas.[1][8][10]
For rashes, photo-based teledermatology can be useful, especially for common inflammatory skin conditions, but accuracy depends heavily on image quality and whether the clinician also gets the history, symptom details, and lesion progression.[4][5][9] One review found teledermatology for skin neoplasms had moderate accuracy overall, and another reported substantial variability across studies, with better results when dermoscopic images and expert interpretation were available.[4][5]
The practical bottom line is:
- Good for: initial assessment, triage, follow-up, and deciding whether you need an in-person visit.[4][5][12]
- Not enough for: any lesion that is changing, bleeding, irregular, painful, rapidly growing, or otherwise concerning for skin cancer, where an in-person exam and often biopsy are still needed.[1][9][10]
- Best option: a board-certified dermatologist using photos plus your history, not an automated app.[1][10][12]
If you want, I can also give you a checklist for taking photos that improve a teledermatology review.