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DermDiag

An online tool is designed to help you understand your skin condition.

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DermDiag	By Dermnet NZ
	Features Education and information. Interactive. Image library.
Country of origin	New Zealand
Clinical 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. Brochures: Tips to improve your privacy and security [PDF, 65 KB] Healthify He Puna Waiora, NZ Staying safe online(external link) Netsafe, NZ
Cost	Free
Advertisements	This app contains no ads.
How to access the tool	(external link)

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.

PROS	CONS
✔ Based on the textbook Differential 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. ✔ Diagnoses are colour-coded to show whether they are common vs. rare conditions. ✔ Easy navigation. ✔ Questions are easy to answer, and only takes a few minutes to complete.	✘ Some people may find the language challenging at times, but a glossary is provided. ✘ The glossary contains language that some people may find difficult to understand.

PROS

CONS

✔ Based on the textbook Differential 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.

✔ Diagnoses are colour-coded to show whether they are common vs. rare conditions.

✔ Easy navigation.

✔ Questions are easy to answer, and only takes a few minutes to complete.

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

✘ The glossary contains language that some people may find difficult to understand.

Clinical review

Reviewer: Emma Riddell, Clinical Pharmacist, Health New Zealand Te Whatu Ora
Date of review: April 2025
Platform: web browser
Comments: This tool is a very useful way to help identify possible causes of skin conditions. It can be used by health professionals as well as by the general public. The tool asks a few questions about the affected skin, such as area affected & appearance of affected skin. It only takes a few minutes to complete, and then the tool gives possible diagnoses. You can click on a potential diagnosis to be directed to the relevant page on DermNet, where you can read more about the condition.
The questions are easy to answer (e.g. “Is the skin lesion / area RED?”), and often include photo examples to help choose the best answer. However, when you are given a list of possible conditions, it could be difficult for non-health trained users to understand, as the language is often targeted at health professionals. I also found that the glossary often contained language that may be difficult for users to understand.
Overall, I found this to be a very high quality tool, and would advise using this in conjunction with a healthcare professional (e.g. GP, pharmacist) to help with diagnosis and treatment of skin conditions.
Safety concerns: None – there are appropriate warnings.
New Zealand relevance: Relevant to New Zealanders. Developed by DermNet NZ.

Skin infections
NZ Health App Library
Consumer guide: how to choose a health app
Clinicians guide: how to choose a health app

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.