What are the 10 most common skin disorders?

The most common skin conditions seen in Canadian adults include acne, eczema (atopic dermatitis), psoriasis, rosacea, seborrheic dermatitis, contact dermatitis, tinea (fungal infections), warts, basal cell carcinoma, and melanoma. Acne and eczema together account for the largest share of dermatology referrals in Canada. If you have a spot or lesion you are uncertain about, a clear photograph taken following the steps in this guide gives a dermatologist or teledermatology platform enough information to advise whether an in-person visit is needed.

How to Photograph Skin Conditions at Home

Q: Can I take a picture of a rash to see what it is?

A photo of a rash can support a clinical assessment but cannot replace one. A well-taken image lets a dermatologist or AI-assisted screening tool evaluate colour, distribution, border, and texture enough to triage urgency and suggest likely diagnoses. What a photo cannot show is temperature, how the rash feels to the touch, or whether it blanches under pressure. If your rash spreads rapidly, involves your mouth or eyes, or comes with fever or breathing difficulty, seek emergency care instead of sending a photo. For anything else, a clear image taken in natural light at 15 to 30 cm with flash off gives a clinician enough to advise next steps.

Q: Is there an app to scan skin conditions?

Several applications offer AI-assisted skin screening. DermaDex (dermadex.ca) is a Canadian platform that combines AI-assisted triage with access to certified dermatologists, built to meet Canadian privacy standards. Consumer AI apps vary widely in clinical validation, so check the evidence before relying on results. Health Canada does not currently regulate all standalone consumer skin-scanning apps as medical devices, which means quality controls differ between products. A validated tool used alongside clinician review gives the most reliable pathway. An app result is a starting point, not a diagnosis.

Q: How to take dermatology pictures?

Prepare the area by removing makeup, nail polish, or bandages. Find indirect natural daylight near a window. Set your phone to standard photo mode with flash disabled. Hold the camera 15 to 30 cm from the lesion, place a coin beside it for scale, tap the screen to lock focus directly on the lesion, then shoot. Take three frames: close-up, mid-range showing surrounding skin, and a wider body-location shot. Review the preview immediately so the lesion centre is sharp. Label the file with body location and date before uploading to your clinic or teledermatology platform.

As of August 5, 2025.

A blurry, poorly lit photo of a skin lesion tells your dermatologist almost nothing. A sharp, well-framed image taken in natural daylight can shorten your assessment time and sometimes replace an in-person triage visit entirely. This guide gives you the exact steps to photograph any skin condition — a new mole, a spreading rash, or a patch of discoloured skin — so the image is clinically useful. Before you send anything, review how to do a monthly self-skin check so you know what to look for first.

What lighting works best for skin photos?

Short answer: Indirect natural daylight is the best light source for skin photography. Stand near a window on an overcast day or in open shade outdoors. Overcast light scatters evenly across the skin, so you get true colour and visible texture without highlights that wash out lesion detail. Avoid direct sunlight (harsh shadows), indoor incandescent bulbs (yellow cast), and above all your phone's built-in flash, which creates a specular reflection that flattens texture and disguises the border irregularity a dermatologist needs to assess.

How do you photograph a mole for your doctor?

Short answer: Use natural daylight, hold your camera 15 to 30 cm from the lesion, tap the screen to lock focus directly on the mole, and place a coin or ruler beside it for scale. Disable flash. Take three shots: a close-up of the mole alone, a mid-range view showing 5 cm of surrounding skin, and a wider body-area shot showing location (shoulder, back, shin). This three-shot sequence is the standard protocol recommended by the American Academy of Dermatology (AAD) for teledermatology submissions.

A coin is not decorative. Dermatologists use it to estimate diameter: a Canadian 1-cent coin is 19.1 mm across, which gives an immediate size reference. Without a scale object, a 4 mm lesion and a 14 mm lesion can look identical in a photo.

Does camera resolution affect whether a dermatologist can read your photo?

Short answer: Any smartphone made after 2018 has sufficient resolution for teledermatology. Blur, poor lighting, and missed focus are the real problems. A 12-megapixel photo taken in focus in daylight outperforms a 50-megapixel photo taken in a dim bathroom with flash. If your phone has a portrait or macro mode, macro is preferable for close-up shots; portrait mode adds artificial background blur that can obscure lesion edges. Shoot in standard photo mode and let the lighting and distance do the work.

A 2024 study published in Telemedicine and e-Health found that image quality control is a key factor in teledermatology outcomes. See the teledermatology image quality study for the full data.

What is a teledermatology photo guide you can follow before every upload?

Short answer: Run through this five-point checklist before you send any skin image. Remove makeup, nail polish, or covering dressings from the area first. Set up near a window for natural light. Hold your camera 15 to 30 cm away, tap to focus, and shoot with flash off. Include a coin for scale. Take close-up, mid-range, and location shots. Check the preview: if the lesion looks blurry or the colour looks orange or green, move to better light and reshoot. The 60 seconds you spend on this saves your clinician from requesting a repeat submission.

For a deeper comparison of what visit types are best handled by photo versus in-person assessment, see teledermatology vs in-person visits: when to choose which.

Element	Recommended	Avoid
Light source	Indirect natural daylight, window light on overcast day	Flash, direct sunlight, incandescent bulbs
Camera distance	15-30 cm for close-up; 50-80 cm for mid-range	Less than 10 cm (blurs), more than 1 m (too small)
Background	Plain, contrasting fabric (white towel, dark cloth)	Patterned clothing, carpet, busy backgrounds
Scale object	Coin (19 mm) or ruler placed beside lesion	No scale object, makes size impossible to judge
Focus	Tap screen to focus on lesion; confirm in preview	Auto-focus locked on background or surrounding skin
Camera mode	Standard photo mode; macro if available	Portrait mode, beauty filter, digital zoom
Makeup/coverings	Remove before shooting	Foundation, nail polish, bandages over lesion

Can I take a picture of a rash to see what it is?

Short answer: A photo of a rash can support a clinical assessment, but it cannot replace one. A well-taken image lets a dermatologist or AI (Artificial Intelligence)-assisted screening tool evaluate colour, distribution, border, and texture enough to triage urgency and suggest likely differentials. What a photo cannot show is texture you feel with a finger, skin temperature, or whether the rash blanches under pressure (the glass test for meningococcal disease). If your rash spreads rapidly, involves mucous membranes, or is accompanied by fever or difficulty breathing, seek emergency care rather than sending a photo.

Is there an app to scan skin conditions?

Short answer: Several applications offer AI-assisted skin screening, including DermaDex, which connects patients across Canada to certified dermatologists with AI-assisted triage. Consumer AI apps vary widely in validation quality, so check whether the tool has been evaluated against clinical datasets before relying on results. Health Canada does not currently regulate standalone consumer skin-scanning apps as medical devices in all categories, so user discretion matters. A validated tool used alongside, not instead of, a clinician review gives you the most reliable pathway.

How to take dermatology pictures?

Short answer: The steps are: prepare the area (remove coverings and clean the skin), find indirect natural light, set your phone to standard photo mode with flash off, position yourself 15 to 30 cm from the lesion, place a coin beside it, tap to focus, and shoot three frames. Review the preview immediately: zoom in to confirm the lesion centre is sharp, not the surrounding skin. If the image passes review, label it with body location and date before uploading to your clinic or telehealth platform. Consistent labelling such as left forearm mole Aug 2025 is especially useful for tracking changes over time.

The AAD's patient photography guidance, available at aad.org, outlines the same approach for home documentation.

Sources

American Academy of Dermatology (AAD). "How to take pictures of your skin for your dermatologist." Updated July 20, 2023. https://www.aad.org
Marin-Gomez FX, et al. "Accuracy of a smartphone-based dermatological diagnosis." PubMed/NCBI, 2020. https://pubmed.ncbi.nlm.nih.gov/38150704/
Canadian Dermatology Association (CDA). Teledermatology resources. https://dermatology.ca
National Institutes of Health (NIH) / National Library of Medicine. Dermatology imaging. https://www.ncbi.nlm.nih.gov

Photo Quality Guide: Take Better Skin Photos at Home