You curl up on the couch with a heating pad after a long day. Maybe it’s for back pain, period cramps or sore muscles. The warmth feels good, so you leave it there for a while.
But after weeks and months of using heat in the same spot, you notice something strange. Your skin looks blotchy, almost like a faint lace pattern.
Did you burn your skin or is something else going on?
You might be dealing with toasted skin syndrome. Known medically as erythema ab igne, which means “redness from fire,” toasted skin syndrome happens when your skin is exposed to low levels of heat over and over again. While it may seem harmless at first, ignoring it can cause lasting skin changes.
Here’s what you should know about toasted skin syndrome, why it happens and how to protect your skin.
What is toasted skin syndrome?
Toasted skin syndrome is a rash caused by repeated exposure to heat that isn’t hot enough to burn you right away.
“Toasted skin syndrome happens from repeated exposure to moderate heat, usually between 109° and 116°F (43° to 47°C), over weeks or months,” said Julie Trutanic, DO, a family medicine physician with Banner Health. “While burns cause immediate damage and pain, toasted skin syndrome happens gradually and usually doesn’t hurt.”
What causes toasted skin syndrome?
Toasted skin syndrome has been around for much longer than you think. In the past, doctors often saw it in people who sat near open fires or wood stoves for a long time.
Today, many everyday items can cause it, including:
- Heating pads or hot water bottles
- Electric blankets
- Space heaters
- Laptop computers resting on the skin
- Heated car seats
- Heating lamps or fireplaces
What does toasted skin syndrome look and feel like?
One of the most noticeable signs is a distinctive patterned rash. The rash looks like a fishnet or lace design.
“This lacy look happens because heat damages tiny blood vessels in the skin,” Dr. Trutanic said. “As these vessels expand and break down, they create uneven areas of pigment. The pattern follows the network of blood vessels beneath the skin, which is why it looks like a web.”
Other symptoms may include:
- Mild redness
- Slight itching or burning
- Thinner skin or thickened, rough skin
- Skin discoloration (darkening or redness) in one area at first
The rash might fade when you press on it. As the condition worsens, the color no longer fades. It is usually seen on the lower back, stomach, thighs or legs, depending on the location of the heat source.
Who is most at risk?
Anyone who uses heat therapy can develop toasted skin syndrome. But some people are more likely to get it.
Dr. Trutanic said the condition is often diagnosed in:
- People in their mid- to late 20s
- People who live in colder climates
- People with chronic pain who regularly use heating pads
- People who frequently place laptops on their laps
People with chronic conditions, such as arthritis, muscle injuries or period cramps, may rely on heat more often, which increases the risk.
Is toasted skin syndrome dangerous?
Most cases are not dangerous but they should be taken seriously. If caught early and the heat source is removed, the skin usually heals on its own over time.
However, repeated heat exposure can cause permanent skin discoloration. In very rare cases, long-term damage from toasted skin syndrome has been linked to some types of skin cancer, like squamous cell carcinoma and Merkel cell carcinoma.
This risk is low but it is one reason health care providers suggest stopping heat exposure once the condition appears.
When to see a health care provider
If you notice skin changes that don’t fade, talk with a health care provider.
Seek medical advice if:
- The pattern lasts longer than a few weeks
- The area becomes darker or thicker
- You develop sores or bumps
- The skin becomes painful or itchy
Several skin conditions, such as livedo reticularis, rosacea and contact dermatitis, can cause redness or discoloration that looks like toasted skin syndrome. Because these symptoms can be similar, it’s important to see a provider to find out what’s really causing your rash.
How to treat toasted skin syndrome
“The first step in treating this condition is to stop exposure to the heat source,” Dr. Trutanic said. “Continued heat exposure can worsen the discoloration and increase the risk of permanent skin changes.”
In addition to removing heat, you can support healing with gentle skincare:
- Hydrate and soothe your skin: Moisturizing helps repair the skin barrier and reduce irritation. Dr. Trutanic suggests using ceramides, hyaluronic acid, shea butter, coconut oil and aloe vera.
- Use cool compresses: Place a cool cloth on your skin to help stop itching and irritation. Use it for a short time to calm your skin.
- Avoid harsh products: Fragrance, strong soaps and irritating skincare products can make the rash worse. Use gentle, fragrance-free cleansers and lotions while your skin heals.
- Protect your skin from the sun: Sun exposure can make discoloration worse. Use a broad-spectrum sunscreen with SPF 30 or higher to stop the rash from darkening and help it heal.
- Eat a healthy diet: Foods rich in healthy fats, vitamin A, vitamin C and antioxidants, along with staying well hydrated, can help your skin repair.
Treatments for lingering discoloration
In mild cases, the rash fades within weeks or months after stopping heat exposure. But if your skin is still discolored, your provider may suggest treatments to make it lighter.
Options may include:
- Prescription topical retinoids
- Hydroquinone or other skin-lightening creams
- Vitamin C serums
- Niacinamide (vitamin B3) products
- Turmeric paste
- Gentle exfoliation with yogurt or oatmeal masks
“For more severe or persistent cases, laser therapy and chemical peels can be considered with the help of a dermatologist,” Dr. Trutanic said.
How to prevent toasted skin syndrome
Prevention mostly involves limiting direct exposure to heat. Dr. Trutanic recommends a few simple habits to help lower your risk:
- Avoid placing laptops directly on your legs
- Limit heating pad use (30 minutes at a time)
- Use a protective barrier when heat touches your skin, such as a towel or thick cloth
- Use the lowest effective heat setting
- Pay attention to early skin changes
The bottom line
Heating pads, laptops and space heaters can make life more comfortable, especially when you are cold or have aches and pains. But using heat repeatedly can sometimes damage your skin in unexpected ways.
Toasted skin syndrome happens slowly and might not hurt, so it’s easy to miss. Pay attention to your skin and notice any changes. If you see changes, stop using the heat source and take care of your skin. If your skin doesn’t get better, talk to your provider or a Banner Health specialist.
