Skin Cancer Check with Skin Photos - Online App

This free skin cancer check online app can identify potential skin cancer from skin photo images or directly from camera of mobile devices. It measures probability of being cancerous or risk for skin lesions and moles. This is software service powered by Artificial Intelligence (AI) Machine Learning Deep Neural Network Models. This system has very high accuracy. But is NOT 100% accurate! (See Limitations & About Accuracy.) Note that this is not a medical diagnosis system nor screening device. For accurate medical diagnosis, you may need biopsy and pathological tests. There are limitations what photos can tell you! Visual photo analysis cannot replace biopsy and pathological tests. Certain skin cancer lesions look alike pimple or rash, especially at early stage, and skin infection. This system can make errors. Note that pimple or rash normally improves or disappears in days. Unhealing skin infections which look similar to skin cancer may still require treatment. Therefore if conditions don't improve, see a doctor or dermatologist for medical diagnosis and treatments.

Currently online app is not available. If you want to use for experimental purpose now, please Contact Us. We will provide back door information.

Skin Cancer Detection Method

Skin cancer is "the abnormal growth of abnormal cells" in the outer skin layer. When you have malignant skin cancer, you will notice some of the following conditions in your skin lesions, moles, spots;

  • Grow in size or new
  • Change color
  • Change shape
  • Bleed or ooze or crusty
  • Itch or sore

If some of these conditions occur in your skin lesions and conditions do not improve, it's safer to see a doctor or dermatologist for diagnosis and treatment before too late.

Photo Requirements

To be accurate, photos require that the following conditions are met. Please take photos with this requirement in mind;

  • Color photos. Black and white photos are not supported.
  • Blurry photos are bad. Keep camera well focused while taking photos.
  • Highest resolution that your camera supports recommended.
  • Close-up photos are recommended. Relative sizes of skin lesion in photos should not be too tiny. 5% to 50% of photo size is recommended. Lower ratio will be fine for high resolution photos. Use the "zoom image" option to enlarge.
  • Photos should not be everything too bright or too dark. Clearly discernable skin lesions are essential for high accuracy.
  • Avoid excessive light reflection. It can cause errors.
  • Supported file formats: JPEG, PNG, WebP, GIF, BMP, SVG, etc.

Skin Lesion Selection

Accurate skin lesion selection is very important for higher accuracy. Select or adjust the selection box such that the box to be tight but a little wider to the skin lesion. Choose one of the following options and drag the mouse;

  • ⇱ top and left borders (move): To align top and left borders. This moves the whole selection box.
  • ⇲ bottom and right borders: To align bottom and right borders. This moves only the bottom and right borders.
  • ⛞ click and drag: Pick/click the top right corner and drag to the bottom right corner.
  • ↕ zoom image: Zoom in and out the image. Dragging the mouse upward will enlarge. Downward will reduce the image size. Up to 100 times digital zoom.
  • ✥ shift image: To shift the image to show different part of the image, drag the mouse into desired direction.
  • ⤡ resize canvas: To reduce the canvas size, drag the mouse towards the top left corner diagonally. To enlarge the canvas, swipe in the opposite direction.

First three options are for box border adjustment. Next two options are for image size and positioning. The last option is for resizing the canvas.

If skin lesion is too small, it's difficult to draw a "tight but a little wider" box. Use the "zoom image" and "shift image" options to enlarge and move lesions. Enlarge the skin lesion to occupy at least 10% of the canvas and then adjust the selection box. High resolution photos are always recommended for this purpose.

When enlarged excessively, skin lesion boundary may not be clear. Reducing the size of the canvas with the "resize canvas" option may help.


Testing revealed the following three main sources of errors;

  1. Blurry skin lesions: Unfocused or tiny skin lesions on low resolution photos can cause this error. Keep camera well focused while taking photos. Use high resolution close-up photos.
  2. Similarity of cancer and non cancer images: Some skin cancer looks like skin infection, rash or pimple. If conditions don't improve, see a doctor or dermatologist.
  3. No clear color difference:When a skin lesion has no clear color difference from surrounding area, this can make error!

The first problem is for users to improve photo quality. The other two problems have no clear solutions at the mement. In these cases, use this system with these in mind.

[False negatives] Certain skin cancer looks similar to pimples or skin rash. In this case, this system may classify as low risk. Note that pimples and skin rash improve or disappear in days. If conditions don't improve in days, see a doctor or dermatologist.

[False positives] Some bad skin infections look similar to skin cancer. This system may make mistakes. If conditions don't improve, you may need to see a doctor for treatment.

Note that this system doesn't work well with dark skin. This is a limitation of this system.

About Accuracy

Three deep neural network models, employing advanced proprietary algorithms and trained with 1 million photo images, are used. It has very high accuracy well over 90%. On 1 million training dataset images, 96% sensitivity and 90% specificity, 93% combined accuracy. (Note that sensitivity is the rate of detecting cancer as cancer. Specificity is the rate of detecting non-cancer as non-cancer.) Further tests on 3,300 skin cancer photos that were not used in training showed over 97% detection rates. Errors were mostly with poor photo quality. With good photo quality, 99% sensitivity is expected. Notice that this is not 100% detection rate! So care should be taken. Accuracy of detecting not-cancer images as not-cancer is high. But less accurate than detecting cancer images. Note that some bad skin infection photos look alike cancer on visual level. So this system may rate as high risk. When conditions don't improve, always check with a doctor!

Skin Cancer Types Detected

All three main types of skin cancer are detected: melanoma, basal cell carcinoma (BCC), and squamous cell carcinoma (SCC);

  1. Melanoma is the most dangerous skin cancer. It can grow quickly and spread. Melanoma can become life-threatening in as little as six weeks. When detected or in doubt, see a doctor immediately!

  2. Basal cell carcinoma (BCC) is the most common but least dangerous. It grows slowly on head, neck and upper body.

  3. Squamous cell carcinoma (SCC) can grow over months and spread to other parts of body.

Merkel cell carcinoma (MCC) and Bowen's disease (BD) are also detected. Actinic keratosis (AK), which can become cancerous, is also detected.

System Requirements

This system runs on any JavaScript-enabled web browser. Your computer or mobile device may need at least 2GB RAM to enable JavaScript to process images. In addition, a camera or a camera enabled mobile device may be needed to take photos.

About Data and Privacy

This site does not collect data nor use cookies. Only the selected parts of images are sent to a server for analysis. Then discarded!