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I had 5 days of radiation, now 3 weeks later I have a fierce rash on my chest, how long does it typically take for the rash to subside?

A MyBCTeam Member asked a question 💭
Lake Geneva, WI
October 26, 2025
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A MyBCTeam Member

I just finished radiation on September 15th. Had 20 sessions to breast, armpit, and neck with 4 boosts at the end. About 3 weeks after radiation was done I got a burn/rash on my neck and where they did the boost on my chest. My neck and chest burned pretty good for the first couple weeks, but now they aren't bothering me. I'm at the point where the skin has all blistered and peeled from my neck and my chest is still peeling a little bit. I've been using lotion a couple of times a day. My doctor said to use hydrocortisone cream if it got itchy, but I avoided that since I'm trying to get the steroids and their side effects from chemo out of my body.

October 26, 2025
MyBCTeam

How long does a radiation-related rash typically take to subside after treatment?

Most short-term side effects from radiation therapy, including skin changes and rashes, tend to go away four to eight weeks after finishing treatment. However, the treated skin may remain more sensitive even after the rash heals.

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How long does a radiation-related rash typically take to subside after treatment?

Most short-term side effects from radiation therapy, including skin changes and rashes, tend to go away four to eight weeks after finishing treatment. However, the treated skin may remain more sensitive even after the rash heals.

Since you're experiencing a fierce rash three weeks post-radiation, you're likely still within the normal healing timeframe. That said, it's important to contact your radiation oncologist about this rash, especially since it's causing significant discomfort.

Here are some ways to help manage your skin during this healing period:

* Use mild, unscented, alcohol-free soaps and lotions
* Keep the affected area clean and dry
* Apply moisturizer while skin is still slightly damp
* Protect the area from sun exposure with sunscreen (SPF 30+) and loose clothing
* Avoid heating pads, ice packs, talcum powder, and antiperspirants on the affected area

A MyBCTeam member shared a similar experience: "A few days ago I developed a heat rash between and under both breasts. Little blisters and some are open. Nasty. The radiation oncologist gave me a prescription cream to use twice a day."

Your doctor may prescribe a medicated cream to help speed up healing and provide relief. Don't hesitate to reach out to them if the rash worsens, blisters, or shows signs of infection.

October 26, 2025

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