Radiation Therapy for Skin Cancer: What To Expect and When It’s Used

Some people with nonmelanoma skin cancers like basal cell carcinoma (BCC) or squamous cell carcinoma (SCC) are surprised to learn that radiation therapy may be a treatment option for them. This is particularly true if surgery could affect how you look or how that area of skin functions.

Radiation therapy uses high-energy rays to target and destroy cancer cells while sparing the healthy tissue around them. Research shows it has high local control rates. This means it’s very good at stopping the cancer right where it started.

Here’s what to know about when radiation is recommended, how it’s delivered, and how to care for your skin along the way.

How Is Radiation Therapy Delivered?

There are two main ways radiation therapy reaches a skin tumor. Both are designed to concentrate the dose precisely while protecting the healthy tissue around it.

External Beam Radiation Therapy

The most common approach delivers radiation from outside the body.

Superficial radiation (soft X-ray therapy) works best for shallow, well-defined lesions. Electron beam radiotherapy can reach slightly deeper tumors and larger areas.

Neither penetrates much beyond the skin, which is intentional. This protects the tissue underneath.

The procedure itself is painless. It’s a bit like getting an X-ray, just stronger and more precisely targeted.

Brachytherapy

Brachytherapy works differently. A small applicator is placed on or inside the tumor. A temporary radioactive source is then briefly inserted.

Because the radiation only travels a short distance, nearby tissue is largely spared. It’s especially useful for head and neck tumors and often requires fewer sessions than external radiation.

What Is a Course of Radiation Treatment Like?

Understanding each step — from the first planning visit through the final session — can make the process feel far less daunting.

Planning and Simulation

Before treatment begins, a radiation oncologist maps out the exact dose needed and identifies which areas to protect. Planning may involve imaging scans and small reference marks — usually small tattoo markings — placed on the skin. These allow the machine to line up precisely the same way every session.

What To Expect During Sessions

Most radiation therapy treatment schedules for nonmelanoma skin cancer run once a day, Monday through Friday. This lasts anywhere from one to six weeks, depending on the tumor’s type, size, and location. Older or frail people may be treated less often, and some need only a single session.

Each session takes only minutes, but setup takes longer. The machine may shift positions to deliver radiation from different angles.

The clicking sounds and laser beams you’ll see during alignment are completely normal. You can talk to your care team through an intercom the whole time while they watch from the next room.

You won’t become radioactive from this type of radiation. It’s completely safe to be around family, friends, and children throughout treatment.

What Short-Term Side Effects Can Radiation Cause?

Short-term side effects are usually limited to the treated area. They may include dryness, itching, peeling, skin color changes, temporary hair loss (if radiation is given to the skull), and fatigue. Most of these appear during or just after treatment, and typically clear up once it’s done.

You might:

• Experience discoloration and soreness — This feels like a sunburn but usually fades after treatment, showing up as warmth and redness on lighter skin tones or darkening on deeper skin tones.
• Develop dry, itchy, or crusting skin — New skin forms as scabs heal, so avoid scratching and use only approved soothing products.
• Notice hair loss in the treatment area — Lower doses often allow regrowth, but higher doses can cause permanent hair loss in the treated patch.
• Feel fatigue — This is a common side effect that is often worsened by daily travel to appointments.
• See some bleeding from the tumor itself — Lesions that were already fragile or ulcerated can occasionally bleed during treatment. Apply gentle pressure with a clean, dry cloth if this occurs.
• Notice dry mouth — When radiation is delivered close to the jaw, cheek, or upper neck, it can affect saliva production.

With longer treatment courses, side effects can become more noticeable. That’s why it’s important to keep your care team in the loop throughout.

What Long-Term Changes Should You Know About?

Radiation offers high cure rates, especially for early-stage SCC, but it can cause lasting changes to skin pigmentation or texture in the treated area. The skin there will also become more sensitive to the sun, making sun protection a lifelong habit.

In rare cases, a new skin cancer can develop in a previously irradiated area years later. This is one reason radiation isn’t usually the first choice for younger people. It’s also generally avoided — or used only with caution — in people with certain inherited conditions, such as:

• Basal cell nevus syndrome
• Xeroderma pigmentosum
• Ataxia-telangiectasia
• Li-Fraumeni syndrome
• Poorly controlled connective tissue diseases like lupus or scleroderma

One important limitation: If a tumor comes back in a previously irradiated area, radiation usually can’t be used there again. The risk of serious side effects is too high. Your oncology or dermatology care team can walk you through which other options are available.

How Should You Care for Your Skin During and After Treatment?

Looking after the treated area plays a meaningful role in comfort and recovery. Care teams typically advise that you:

• Wash gently with warm water, and pat dry with a soft towel instead of rubbing.
• Avoid perfumed soaps, lotions, or creams on the treatment area unless the care team has specifically approved them.
• Stop shaving the treatment area, and ask the care team about safer alternatives.
• Protect the treated skin from sun exposure during and after treatment, as permanent ultraviolet sensitivity makes sun protection an ongoing habit rather than a temporary precaution.
• Watch for signs of infection, and promptly report any green or yellow discharge, or skin that looks or smells unusual, to the care team.
• Report any bleeding at the treatment site right away.
• Attend regular check-ins during treatment so the care team can catch and manage any side effects early.

Your Action Plan

Radiation therapy for skin cancer can be highly effective, especially when surgery isn’t the right fit or when extra support is needed after an operation. Understanding the process, from planning to long-term skin care, helps you move forward with more confidence.

Before your next appointment, jot down any questions about your treatment schedule, side effects, or skin care routine. Gather the products you currently use on your skin so your care team can review them before treatment starts. If you spend time outdoors, ask about a sun-protection plan for the treated area.

Your radiation oncologist and care team are your best resource. Don’t hesitate to reach out between appointments if something changes or doesn’t feel right.

Join the Conversation

On MySkinCancerTeam, people share their experiences with skin cancer, get advice, and find support from others who understand.

Were you given a choice between surgery and radiation? What helped you decide? Let others know in the comments below.