When you have a desmoid tumor, most of the focus is on easing pain or stopping these soft-tissue tumors from growing. But many people are surprised by how much treatment can affect their skin. Skin changes can be uncomfortable, stressful, and sometimes scary. One MyDesmoidTumorTeam member wrote: “I just started [medical therapy]. My skin is so itchy! Anyone else?” The good news is that most skin side effects are manageable, and many go away after treatment ends.

This article explains what can happen to your skin with different desmoid tumor treatment options, how common these side effects are, and what you can do to feel better. We will also talk about skin changes you should pay attention to.

Why Desmoid Tumor Treatments Affect the Skin

Your skin is your body’s largest organ. It renews itself quickly and depends on healthy cells, good blood flow, and normal immune responses. Many cancer treatments, including those used for desmoid tumors, work by slowing down or changing how cells grow and communicate. Because skin cells grow fast, they are often affected, too.

Different treatments affect the skin in different ways. Targeted therapies act on specific signals in cells. Chemotherapy affects fast-growing cells, radiation damages cells in a focused area, and surgery directly cuts through skin and tissue. Each approach comes with its own skin-related effects, which we will explore further.

Skin Side Effects From Targeted Therapies

Targeted therapies, like nirogacestat (Ogsiveo), are drugs that block specific pathways that help desmoid tumors grow. These medications are often taken by mouth and can be used for long periods of time.

Common Skin Changes

Skin side effects are very common with targeted therapies. Studies of people with desmoid tumors and other cancers show that many people develop some type of skin reaction from targeted therapies. Common issues include:

• Acne-like rash, often on the face, chest, or back
• Dry, itchy skin
• Redness or discoloration
• Skin sensitivity
• Cracks in the skin, especially on the hands and feet

This acne-like rash is not caused by dirt or poor hygiene. It happens because the drug interferes with signals that help skin cells grow and repair themselves.

How Common Are These Effects?

Skin reactions are among the most frequent side effects of targeted therapies. Research shows that more than half of people who are taking certain targeted medications like nirogacestat experience some level of skin toxicity. For most people, the rash is mild to moderate, but it can still affect comfort and self-confidence.

Tips for Relief

Here are some tips for relief if you’re experiencing a skin reaction from your targeted treatment:

• Use gentle, fragrance-free cleansers and moisturizers
• Protect your skin from the sun with hats and sunscreen
• Let your care team know right away if you get a rash

Doctors may prescribe creams and antibiotics, or modify doses if needed, as recommended in supportive care guidelines.

Skin Side Effects From Chemotherapy

Chemotherapy works by killing fast-growing cells. While this can help control tumor growth, it also affects healthy cells in the skin, hair, and nails.

Common Skin Problems

People receiving chemotherapy for desmoid tumors may notice:

• Dry or flaky skin
• Darkening or lightening of skin color
• Increased sensitivity to sunlight
• Brittle or discolored nails
• Hair thinning or hair loss

Some people also develop rashes that itch or burn. These changes are well documented in oncology care resources.

How Common Are These Effects?

Not everyone with a desmoid tumor gets chemotherapy, but when chemo is used, skin changes are fairly common. Most skin symptoms are mild and improve after treatment ends.

Tips for Relief

Here are some tips for relief if you’re experiencing a skin reaction from your chemotherapy treatment:

• Moisturize at least twice a day.
• Use sunscreen every day, even when it’s cloudy.
• Wear soft, loose clothing and avoid tight shoes.

Always notify your care team if you notice any new skin changes during or after your chemotherapy treatment.

Skin Side Effects From Radiation Therapy

Radiation therapy is sometimes used to treat desmoid tumors. Radiation uses high-energy rays to damage tumor cells. The skin in the treated area absorbs some of that energy, which often makes it react.

Common Skin Reactions

Radiation-related skin changes usually happen only in the area being treated. These changes may include:

• Redness, like a sunburn, or other changes in color, depending on skin tone
• Dryness and itching
• Peeling or blistering in more severe cases
• Darkening of the skin over time

This condition is often called radiation dermatitis. It’s a well-known side effect of radiation therapy.

How Common Is Radiation Dermatitis?

Most people who receive radiation will have some skin reaction. Mild redness or other changes in skin color are very common. More severe reactions are less common and depend on the radiation dose and length of treatment.

Tips for Relief

Here are some tips for relief if you’re experiencing a skin reaction from your radiation treatment:

• Keep the treated area clean with mild soaps
• Use only products approved by your radiation team
• Avoid tight clothing over the area
• Do not scratch or rub the skin

Skin usually heals in a few weeks after radiation ends, though some color changes may last longer. Your doctor may prescribe you a topical steroid medication to help with the symptoms.

Skin Effects of Surgery for Desmoid Tumors

Surgery removes the tumor by cutting through the skin and connective tissues. The skin must heal afterward, which can involve scars and other changes.

Common Skin-Related Outcomes

After surgery, you may notice:

• A visible scar
• Sharp pains near the incision site that happen at random
• Numbness or sensitivity near the scar
• Changes in skin shape or texture

Surgery for desmoid tumors can be straightforward or complex, depending on tumor size and location. Surgery is no longer the main treatment recommended for desmoid tumors.

How Common Are Problems After Surgery?

Most surgical scars heal without major issues. However, desmoid tumors can be large or deep, which sometimes leads to longer healing times or more noticeable scars.

Tips for Healing

Here are some tips for healing if you’re experiencing a skin reaction from your surgical treatment:

• Follow wound care instructions closely
• Keep the incision clean
• Watch for signs of infection
• Ask about scar care once healing begins

Avoiding big movements, such as heavy lifting and intense exercise, will also help you heal faster.

When Skin Side Effects Are a Red Flag

Most skin changes from treatment are not dangerous. Still, some signs should never be ignored. Contact your healthcare team right away if you notice:

• Rapidly spreading swelling, redness, or another change in skin color
• Severe pain, warmth, or pus, which may signal infection
• Fever along with a skin rash
• Open sores that do not heal
• Blistering or peeling over large areas of skin

These symptoms can point to serious reactions or infection and need quick medical attention. Make sure to tell your provider immediately if you experience any of them.

Taking Care of Your Skin During Treatment

Skin care is not just about comfort. Healthy skin lowers the risk of infection and helps you feel more like yourself. Doctors recommend simple routines focused on protection and moisture during cancer treatment. Helpful habits include:

• Using mild soap and lukewarm water
• Moisturizing daily
• Protecting skin from the sun and extreme cold
• Speaking up early about skin changes

No concern is too small. Early care can stop mild problems from becoming big ones.

Join the Conversation

On MyDesmoidTumorTeam, people share their experiences with desmoid tumors, get advice, and find support from others who understand.

How has your skin changed since starting desmoid tumor treatment? Let others know in the comments below.