Mole changing shape

Overview

A mole that is changing shape means its size, color, or outline is different from before. Most moles are harmless, but a change can sometimes be a sign of skin cancer, so it is important to get it checked.

Moles that change shape are fairly common, but only a small number of these changes turn out to be skin cancer. It is always wise to see a doctor to be sure.

Anyone can have a mole that changes shape, but people with fair skin, many moles, or a family history of skin cancer are at higher risk. It can occur at any age, though the risk increases with age and sun exposure.

Symptoms

Common symptoms

• Asymmetry – one half of the mole does not match the other half.
• Border – the edges are irregular, ragged, or blurred.
• Color – the mole has more than one color (shades of brown, black, red, white, or blue).
• Diameter – the mole is larger than 6 mm (about the size of a pencil eraser), though some melanomas can be smaller.
• Evolving – the mole is changing in size, shape, or color, or it starts to itch, bleed, or crust.

Symptoms in children

• Children can have new moles appear as they grow, but changes in color or shape should still be checked by a doctor.
• A mole that bleeds or itches in a child is not typical and should be seen by a healthcare provider.

Symptoms in older adults

• New moles are less common in older adults, so any new mole or change in an existing mole should be evaluated.
• Older adults may have thinner skin, so changes can be more noticeable.

Causes

Main causes

• Sun exposure – ultraviolet (UV) light from the sun or sunbeds can damage skin cells and cause moles to change.
• Genetics – some people inherit a tendency to develop moles that can turn into skin cancer.
• Skin type – people with fair skin, light hair, and light eyes are more prone to changes in moles.

Risk factors

• Having many moles (more than 50) or atypical (unusual-looking) moles.
• A history of sunburns, especially blistering sunburns in childhood.
• A personal or family history of skin cancer.
• Weakened immune system (from illness or medication).

When to see a doctor

See a doctor urgently if:

• Any mole that has changed in shape, size, or color within the past few weeks or months.
• A mole that is bleeding, itching, or painful.
• A new mole that appears after age 30.

Book a routine appointment if:

• Check your moles regularly (once a month) and see your doctor for a full skin exam every year, especially if you have risk factors.
• If you have many moles or a family history, ask about having a specialist check.

Diagnosis

Your doctor will look at the mole closely and ask about any changes. They may use a special magnifying tool called a dermatoscope to see the mole in more detail.

Tests that may be done

• Dermatoscopy – a handheld device that magnifies the skin.
• Biopsy – if the mole looks suspicious, the doctor may remove it completely or take a small sample to send to a lab for testing.

What to expect at your appointment

The exam is quick and painless. If a biopsy is needed, you will receive local anesthetic (numbing medicine) so you don't feel pain. Results usually take a week or two.

Treatment

Treatment depends on whether the mole is benign (not cancer) or malignant (cancer). If it is benign, no treatment is needed. If it is cancerous, the main treatment is surgical removal. Other therapies may be used for advanced cases.

Self-care at home

• Protect your skin from the sun with sunscreen, hats, and clothing.
• Avoid sunbeds and limit time in direct sunlight, especially between 10 a.m. and 4 p.m.
• Check your skin monthly for any new or changing moles.

Medical treatments

For cancerous moles, the doctor will remove the mole and a small area of healthy skin around it (called wide local excision). For deeper or spreading cancers, additional treatments such as immunotherapy or targeted therapy may be used. Your specialist will discuss the best plan for you.

When is surgery considered?

Surgery is the main treatment for skin cancer. It is done under local anesthetic (you are awake but the area is numb). In some cases, a sentinel lymph node biopsy may be done to see if the cancer has spread.

Living with this condition

Keep an eye on your skin. Use sunscreen daily and wear protective clothing. If you have had a mole removed, follow your doctor's instructions for wound care.

Lifestyle tips

• Avoid sunbeds and tanning outdoors.
• Wear a hat, sunglasses, and long sleeves in strong sunlight.
• Check your skin monthly and see a doctor yearly.

Diet and exercise

Eating a balanced diet and staying active help your overall health, but there is no specific diet that prevents mole changes. A healthy lifestyle supports your immune system.

Mental health and emotional wellbeing

It is normal to worry about a mole change. Most changes are harmless, and early treatment for skin cancer is very successful. If you feel anxious, talk to your doctor or a counselor.

Prevention

You can lower your risk of harmful mole changes by protecting your skin from UV rays. Avoid sunbeds, use sunscreen, and wear protective clothing. Checking your skin regularly helps catch changes early.

Screening programmes

Regular self-examination of your skin and annual checks by a doctor are recommended, especially if you have risk factors. Some countries offer skin cancer screening programs – ask your local health service.

Complications

If left untreated

• If a cancerous mole (melanoma) is not treated, it can grow deeper and spread to other parts of the body, which can be serious.
• Other complications include infection or scarring if the mole is irritated or picked at.

Long-term outlook

The outlook is very good for people whose mole changes are caught early. Most skin cancers are cured with surgery. Even for more advanced cases, treatments are improving all the time. The key is to see a doctor as soon as you notice a change.

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