Skin Cancer: How to Recognize the Warning Signs Before It's Too Late

Cassie Ogren
2 days ago
4 min read

A Guide to Early Detection, Prevention, and When to Seek Medical Care

Your skin is your body's largest organ, and it's constantly communicating with you.

Sometimes that communication comes in the form of a new mole, a spot that won't heal, a rough patch that keeps returning, or a lesion that simply doesn't look like your other freckles or moles.

It's easy to dismiss these changes and assume they're "just another age spot."

Unfortunately, that's not always the case.

Skin cancer is the most common cancer in the United States, with millions of cases diagnosed each year. While most skin cancers are highly treatable when caught early, some forms—particularly melanoma—can become life-threatening if they are ignored.

One of the most important things you can do for your health is learn what to look for and seek evaluation as soon as something seems unusual.

Why Is Early Detection So Important?

The encouraging news is that most skin cancers are highly treatable when detected early.

The concerning part is that skin cancer doesn't always stay confined to the skin.

Some cancers, particularly melanoma, have the ability to invade deeper layers of tissue and spread through the lymphatic system or bloodstream to other parts of the body. Once that happens, treatment becomes much more complex.

This is why we never recommend taking a "wait and see" approach with suspicious lesions. If something changes, grows, bleeds, or simply doesn't seem right, have it evaluated promptly by a dermatologist or other qualified medical professional.

What Are the ABCDEs of Skin Cancer?

One of the easiest ways to evaluate a mole or pigmented lesion is by remembering the ABCDE Rule.

A — Asymmetry

Healthy moles are usually symmetrical.

If you imagine drawing a line through the middle, both halves should look relatively similar.

If one side looks noticeably different from the other, it deserves attention.

B — Border

Normal moles often have smooth, even borders.

Suspicious lesions may have edges that are:

Ragged
Notched
Blurry
Irregular

C — Color

Healthy moles are usually one consistent color.

Concerning lesions may contain multiple shades of:

Brown
Black
Red
White
Blue
Gray

Multiple colors within one lesion should always be evaluated.

D — Diameter

Many melanomas are larger than 6 millimeters (about the size of a pencil eraser).

However, smaller melanomas do occur, so don't ignore a lesion simply because it's small.

E — Evolving

This may be the most important warning sign.

Any mole or lesion that changes over time should be evaluated.

Watch for changes in:

Size
Shape
Color
Height
Texture
Symptoms such as itching, bleeding, tenderness, or crusting

What Are Precancerous Lesions?

Not every concerning spot is cancer. Some lesions are considered precancerous, meaning they have the potential to develop into skin cancer if left untreated.

One of the most common examples is actinic keratosis (AK).

These lesions often appear as:

Rough or sandpaper-like patches
Pink or red areas
Thickened or scaly skin
Crusty spots that don't completely heal

They commonly develop on areas with years of cumulative sun exposure, including the face, scalp, ears, chest, forearms, and backs of the hands.

Because actinic keratoses can progress into squamous cell carcinoma, they should be evaluated and treated by a medical professional.

What Does Skin Cancer Treatment Involve?

Treatment depends on several factors, including:

The type of skin cancer
Its size
Its location
How deeply it has grown
Whether it has spread

Many skin cancers are treated by removing the lesion through a surgical procedure. In some cases, specialized techniques such as Mohs surgery are used to preserve as much healthy tissue as possible while ensuring all cancerous cells are removed.

Other treatment options may include:

Prescription topical medications for certain superficial lesions
Cryotherapy (freezing precancerous lesions)
Radiation therapy
Immunotherapy
Targeted medications
Chemotherapy for advanced cancers

Although many people hear that a skin cancer can simply be "cut off," it's important to understand that treatment is much more nuanced than that. If a cancer has invaded deeper tissues or spread beyond the skin, additional treatment may be necessary.

The earlier a lesion is diagnosed, the more straightforward treatment often is.

Who Is Most at Risk for Skin Cancer?

Anyone can develop skin cancer regardless of age or skin tone.

However, your risk may be higher if you have:

Fair skin
Light-colored eyes
Blonde or red hair
A history of blistering sunburns
Frequent outdoor sun exposure
Indoor tanning bed use
A weakened immune system
Numerous moles or atypical moles
A personal or family history of skin cancer

It's important to remember that skin cancer can occur in people of every skin tone. While darker skin tones often have more natural protection from UV damage, they are not immune to skin cancer, and diagnosis may unfortunately occur at later stages because lesions are more easily overlooked.

How Can You Protect Yourself?

The good news is that many cases of skin cancer are preventable.

Simple daily habits can significantly reduce your risk.

We recommend:

Wearing a broad-spectrum SPF 30 or higher every day
Reapplying sunscreen every two hours when outdoors
Wearing wide-brimmed hats and UV-protective clothing
Seeking shade during peak UV hours (typically 10 a.m.–4 p.m.)
Avoiding tanning beds
Performing monthly skin self-checks
Scheduling regular skin examinations if you have risk factors

What Should You Do If You Notice Something Suspicious?

Trust your instincts.

If you notice:

A new spot
A changing mole
A lesion that bleeds easily
A sore that won't heal
A rough patch that keeps returning

don't wait to see if it improves.

Schedule an appointment with a dermatologist or other qualified medical professional for an evaluation. It's always better to hear that a spot is harmless than to delay treatment for something serious.

Healthy Skin Is About More Than Looking Good

At Sanctuary Skin, we're passionate about helping our clients achieve healthier skin—but healthy skin goes beyond glowing complexions and anti-aging treatments. It also means paying attention to changes in your skin and taking them seriously.

While we don't diagnose or treat skin cancer, we frequently encourage clients to seek medical evaluation when we notice lesions that appear unusual or concerning. Early detection saves lives, and we're proud to play a role in helping our community become more aware of the signs.