GentleCure Blog

What Are the ABCDE’s of Skin Cancer?

Skin cancer statistics show that early detection can greatly mitigate the risk posed by common and uncommon forms of the disease. Although annual full-body screenings are always preferred, patients who understand how to identify skin cancer are more likely to seek out the help they need. For that reason, health professionals have developed tools and tricks to improve the effectiveness of at-home screenings—and the ABDCE’s of skin cancer are among the most commonly used.

ABCDEs of Skin Cancer Explained

So, what are the ABCDE’s of skin cancer? Each letter stands for a common visual sign associated with one or more forms of the disease:

  • Asymmetry
  • Border
  • Color
  • Diameter
  • Evolving

If an unexplained growth on your body displays even one of these signs, it’s important to check in with a professional at the earliest opportunity. 

Before we dive into each of these symptoms, keep in mind that skin cancer won’t necessarily manifest with these symptoms. Certain common forms of skin cancer may take other forms—like a red and scaly patch, just to name one example.


An area can be described as asymmetrical if cutting it in half would produce two different shapes.


If the border of the growth is uneven or unclearly defined, it is more likely to be skin cancer.


If the area is not colored uniformly, it deserves closer inspection. That’s true whether there’s a gradient in tone, or a portion of the area that’s colored differently from the rest.


If a growth measures more than six millimeters from edge-to-edge, the risk of cancer is higher. Don’t have a ruler on hand? Six millimeters is roughly the width of a pencil eraser.


An area that is currently changing in size, shape, or color is due for a closer look. Take notes during your regular inspections, and if anything seems different, you’ll have information that you can bring directly to your healthcare provider.

Ask Your Provider About Image-Guided SRT

Although Image-Guided SRT is not a treatment for melanoma, common forms of skin cancer—including basal cell skin cancer and squamous cell skin cancer—can now be treated without surgery or risk of surgical scarring. If you’ve recently been diagnosed with skin cancer, talk to your healthcare provider to find out if Image-Guided SRT is right for you. You can also call us at 855-982-1373 to speak with one of our skin cancer information specialists today.