Verbatim response from Perplexity
Sometimes, but not always. A dermatologist reviewing clear photos with the right context can often make a useful assessment, and remote teledermoscopy has been shown to be nearly as accurate as in-person evaluation for suspicious lesions in at least one study[1]. But photos alone are not a fully reliable diagnosis, especially for subtle rashes or for ruling out skin cancer with complete confidence[6][7].
- For moles, remote specialist review can work well when the images are high quality and include dermoscopy; 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].
- For rashes, photo-based diagnosis is generally less certain because many rashes look similar in pictures and details like texture, scale, warmth, tenderness, and body-wide pattern are hard to judge remotely. This is an inference from the limitations of photo-only assessment; the sources mainly support strong performance for selected lesions rather than broad rash diagnosis[1][6].
- Consumer apps are much less dependable than a dermatologist. A review of smartphone skin apps found low and variable accuracy, with mean top-1 sensitivity of 0.28 and mean accuracy around 0.59, and it warned about false reassurance[6].
- Some services market high accuracy, but those claims vary by tool and study design, and many are not a substitute for a clinician’s exam[3][5][10].
If you want the safest practical rule:
- Use online dermatology for triage: “Should I be seen, and how urgently?”
- Prefer it for changing moles when you can provide sharp, well-lit photos and close-up images.
- Do not rely on photos alone if the spot is growing, bleeding, irregular, painful, or new and changing quickly; in-person evaluation is better in that case[1][7].
If you want, I can also tell you what photo setup gives the most reliable online dermatology review or when a mole/rash should be seen in person instead of online.