What you can and cannot put on your skin during radiation

This page is for people having radiation therapy who want to know which skin products, like deodorant and lotion, are safe on the treated area.

There is one instruction that covers most of what follows. NCI's radiation guide says to check with your doctor before using any skin products on the area being treated.

Not most products. Any.

NCI's sheet is about caring for skin in the treatment area during radiation.

NCI's skin-care sheet lists these products to check with your doctor or nurse before use:

• Bubble bath
• Cornstarch
• Deodorant
• Makeup
• Ointment
• Perfume
• Powder
• Shaving cream
• Skin cream or lotion
• Soap
• Sunscreen

Some of those will surprise you. Cornstarch has a long folk reputation for soothing skin. Sunscreen is normally the responsible choice. Soap is not optional in most people's minds.

That is the point of the list. It is not a list of obviously harsh chemicals. It is a list of things most people would apply without a second thought.

Assume nothing is approved until your radiation team tells you otherwise.

This is the one people ask about most. It comes up often during breast radiation, where the underarm may be in or near the field.

NCI includes deodorant among the products to clear first. NCI's sheet tells you to ask your doctor or nurse which listed products are okay for you.

Practices differ between centers, and your team knows exactly where your field lies. Ask them directly. If the answer is no, ask what you can do about odor. That is a real quality-of-life issue, and they will have heard the question before.

Two categories are not a matter of checking first.

NCI says not to use heating pads or ice packs on the area getting radiation.

NCI also says not to use bandages on that area. If the skin has broken down and you think it needs covering, call your team. Do not reach for a dressing from the bathroom cabinet.

NCI's positive guidance includes:

• Use a lotion your nurse or doctor told you about, and ask when to apply it.
• Shower or bathe in warm, not hot, water. Pat skin dry.
• Wear loose clothes. Choose soft cotton clothes and bed sheets.
• Cover the treated area with clothing when outside.
• Do not use tanning beds.
• Do not rub off the markings your radiation therapist drew on your skin.

The soft fabrics point deserves more attention than it gets. Loose cotton over a treatment area is worth rethinking your wardrobe for.

The most useful thing you can do at your planning appointment is come away with a concrete list.

Ask:

• Which moisturizer they want you to use, and when to apply it
• What to wash with
• About deodorant, sun protection and shaving

Write the answers down, because you will not be able to reconstruct them in a store three weeks later.

The restrictions do not lift the moment your last session ends. Ask your team when you can return to your usual products. Ask separately about sun protection for the treated area in the longer term. That question has a different answer and a longer timeframe.

Most skin changes can wait for your next visit, but some cannot.

• Call your care team the same day if treated skin hurts, stays wet or has sores. NCI calls this a possible moist reaction, and it can lead to infection if not treated. Call right away if you also have a fever of 100.4 F (38 C) or higher or the area looks infected.
• Call your care team within a day or two if a product you used has left the treated area stinging, swollen or much redder, or if dryness and itching are getting worse despite the lotion you were given.

NCI, "Managing Radiation Therapy Side Effects: What To Do About Mild Skin Changes" (NIH Publication 10-6113, opened as a PDF copy) and MedlinePlus, "Skin care during radiation" patient instructions. Both opened 2026-10-02.