Verbatim response from Perplexity
Yes—but only sometimes, and with important limits. For a specific mole or rash photographed well and reviewed by a dermatologist, online assessment can be quite accurate; however, it is not a reliable substitute for an in-person exam or biopsy when cancer is a concern.[1][6]
For moles suspicious for skin cancer, one study found remote teledermoscopy diagnoses were 91% accurate, compared with 93% for in-person dermatologist exams, and both approaches detected 11 of 13 skin cancers in the study.[1] That said, the same source notes the tool is meant for specific skin concerns and is not a substitute for a full-body check.[1]
For smartphone apps or AI-only photo checkers, accuracy is much less dependable. A review of commercially available apps found overall mean accuracy around 0.59, with mean sensitivity only 0.28, and concluded accuracy and sensitivity were highly variable and overall low.[5] Several apps missed melanomas entirely in top-ranked results.[5]
For rashes, photo-based online dermatology can be useful for triage, but photos alone often cannot reliably distinguish among look-alike conditions or confirm a diagnosis without history, touch, or sometimes testing. The provided sources focus more on moles and skin cancer than on rashes, so the strongest evidence here is for triage, not definitive diagnosis.[1][6]
Practical takeaway:
- Good for: deciding whether a spot needs prompt in-person evaluation, especially if it is a single, clearly photographed lesion.[1][6]
- Not enough for: a definitive melanoma diagnosis, a full-body skin cancer screening, or a rash that is changing quickly, widespread, painful, infected, or accompanied by systemic symptoms.[1][6]
- Best-supported option: a board-certified dermatologist’s telehealth visit is more trustworthy than an app alone, and some services also use teledermoscopy or structured photo review rather than simple image upload.[1][6]
If you want, I can also give you a checklist for taking photos that improves the odds of an accurate online dermatology review.