• An online tool is designed to help you understand your skin condition.
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DermDiag By Dermnet NZ


  • Education and information.
  • Interactive.
  • Image library.
Country of origin New Zealand
Clinical review 

5 star review

Read a clinical review below.

Security and privacy Does the app:
  • Collect medical information? No
  • Require a login? No
  • Have password protection? Not necessary
  • Have a privacy policy? Yes
  • Require internet access to use? Yes

Read more about safety and security when using apps.

Tips to improve your privacy and security [PNG, 200 KB] Health Navigator Charitable Trust, NZ
Staying safe online(external link) Netsafe, NZ

Cost Free
Advertisements This app contains no ads.
How to access the tool

DermDiag is an online tool developed by DermNet to help you understand your skin condition. It is intended for educational purposes and doesn't provide medical advice.

By answering a series of questions, and with images to help you along, you are shown a selection of common skin conditions with the characteristics you have chosen.  Although the tool doesn't provide clinical guidance, it helps you to talk to your doctor and to learn more about your skin condition.

For the complete description, go to the website(external link) or, for a more detailed review, see reviews below. 


Based on the textbookDifferential Diagnosis in Dermatologyby Barbara Leppard and Richard Ashton.

Input from dermatologists.

Explains dermatological terms and uses pictures as examples.

Links to the relevant condition pages on DermNet.

Designations regarding disease prevalence where relevant.

Easy navigation.

Some people may find the language challenging at times, but a glossary is provided.


Clinical review

5 star review

:  Jeremy Steinberg, GP, FRNZCGP
Date of review: November 2020
Platform: web browser
Comments: This app is an interactive version of the textbook Differential Diagnosis in Dermatology by Dr Ashton and colleagues. Modifications have been made to the algorithms to better serve the medium. This is an exceptionally useful tool for patients and clinicians alike. It is well known that “googling” your skin rash does not tend to give you the correct diagnosis. This high quality app will help reduce diagnostic error in dermatology. For most users I see no reason to use paid tools like virtualdx over this high quality free tool with the associated extensive database of conditions that DermNet provides.
Safety concerns: None – there are appropriate warnings.
New Zealand relevance: Relevant to New Zealanders. Developed by DermNet NZ.

Disclaimer: The NZ Health App Library is a free consumer service to help you decide whether a health app would be suitable for you. Our review process is independent. We have no relationship with the app developers or companies and no responsibility for the service they provide. This means that if you have an issue with one of the apps we have reviewed, you will need to contact the app developer or company directly.

Credits: Healthify editorial team. Healthify is brought to you by Health Navigator Charitable Trust.