Medical News Today: What causes a rash to feel hot

A rash occurs when there are changes to the appearance of a person’s skin. Usually, the skin becomes red and itchy as well. Another symptom that often accompanies the rash is a hot feeling when it is touched.

This hot feeling is often due to enhanced blood flow to the area as a response to inflammation. Having a rash that is hot to touch can be a sign of a mild or more serious cause.

This article will help a person identify when they should seek medical treatment for their rash.

What causes rashes that are hot to touch?

Many different rash types exist. Some of the common ones that are known to cause skin that is hot to touch can include:

Atopic dermatitis

A rash on a woman's back.
A range of conditions may cause a hot rash.

This eczema type causes plaques to develop on the skin that may be hot to touch. Other symptoms can include:

  • itching
  • redness
  • very dry skin
  • skin scaling
  • fluid-filled lesions

Cellulitis

Cellulitis is an example of a serious cause of a rash that is hot to touch. A bacterial infection causes cellulitis within the deep layers of the skin.

A person with cellulitis can have swelling, tenderness, and redness in the affected area, as well as it feeling hot to touch.

Common areas where cellulitis appears are the lower legs, face, or neck, but it can happen anywhere on the body.

Because cellulitis can cause widespread infection, a person should not delay in seeking medical care.

Contact dermatitis

This rash type occurs when a person comes in contact with something that causes them to be allergic.

Common causes include nickel, other metals in jewelry, makeup, and latex gloves. Diaper rash and cracked hands due to excess water contact are other examples.

Symptoms of contact dermatitis can include:

  • burning
  • itching
  • very dry skin
  • blistering

Cutaneous lupus

Lupus is an autoimmune disorder that can affect the skin and cause rashes, patches, and sores.

This reaction often occurs after a person is exposed to the sun or experiences high levels of stress.

Erythema infectiosum or fifth disease

This condition most commonly affects children and causes a distinct “slapped’ cheek rash on the face that feels warm to the touch. The rash may also occur on the thighs.

Impetigo

Impetigo is a skin infection that occurs due to breaks in the skin that bacteria can then penetrate.

Impetigo can cause a rash that has pustules or fluid-filled bumps that usually have a yellow crust.

While an impetigo rash will sometimes heal with time, a doctor may prescribe antibiotics to treat it quickly.

Scarlet fever

Strep bacteria cause this condition that has symptoms of strep throat, as well as a rash that usually occurs on the upper trunk of the body. The rash can look like sunburn that is rough and hot to the touch and may have small bumps called papules present.

These are just a few examples of common rash causes that may also result in a rash that is hot to touch.


Associated symptoms

When a rash is hot to touch, it is usually due to increased blood flow to the skin.

This extra blood flow can be for several reasons. When a person has an allergic reaction, for example, inflammatory compounds called histamines will cause blood vessels to get bigger. This allows more blood flow that can make the rash feel hot.

Some infections, however, can also make the skin feel hot because the body is increasing the delivery of immune cells to fight an infection.

Rashes can have the following characteristics in addition to being hot to the touch:

  • blistering
  • itching
  • redness
  • swelling
  • pain

Some rashes, such as those caused by a person coming into contact with something they are very allergic to, can set off an allergic reaction known as anaphylaxis.

An anaphylactic reaction can be severe and cause complications beyond the location of the rash. These include difficulty breathing.

An anaphylactic reaction requires emergency medical attention.


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Risk factors

Atopic dermatitis or eczema on back of child's knees.
Children may be at increased risk of rashes that are hot to touch, such as atopic dermatitis.

Children are especially vulnerable to rashes that are hot to touch.

This tendency is because a child’s immune system is not as developed as an adult’s. They are also more likely to come in contact with potentially irritating substances and bacteria.

Older adults and people with conditions that affect their immune system may also be more prone to infections that make the skin red and hot to touch.

Other risk factors include having a history of allergies and allergic reactions. Some skin conditions may run in families and increase the likelihood a person will have a rash that is hot to touch.


When to see a doctor

According to the journal American Family Physician, researchers estimate that more than 12 million doctors’ office visits are made annually in the United States due to rashes in children and adolescents.

While some rashes will go away when a person stops being exposed to what is irritating their skin, others require a doctor’s care.

Symptoms that a person should seek immediate treatment for include:

  • confusion
  • difficulty breathing
  • fever greater than 101.5 degrees Fahrenheit in adults
  • highly painful rash
  • rash that covers more than half of the body

Also, any time people are at all concerned about a rash that feels warm to touch, they should see their doctor.

Treatment options

Treatment depends upon the underlying cause of the rash. Doctors treat cellulitis with antibiotics, for example. They will, however, treat a rash from atopic dermatitis with topical treatments.

Some general treatment rules to ease the itching and burning of a rash that is hot to touch may include:

  • Washing the area with cool water and soap: Applying cool compresses or soft washcloths soaked with cold water may also help to reduce redness.
  • Applying moisturizers or topical corticosteroids: These treatments can reduce itching and inflammation. If a person does not know for sure what is causing their rash, they should check with a doctor before using topical steroids, as these can make some rashes worse.
  • Taking antihistamines: An example of this is diphenhydramine (Benadryl) to reduce inflammation and itching. Again, it is vital to check the guidance on the packet before taking these as they may cause reactions.
  • Taking over-the-counter (OTC) pain relievers: These medications include acetaminophen or ibuprofen, which may alleviate the discomfort associated with a rash.

It is essential to avoid scratching a rash to prevent it from getting worse and scarring.


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Prevention

Man spraying perfume or cologne on her wrist.
Perfumes or colognes may irritate the skin.

Not all rashes are preventable, but there are some methods people can use to keep their skin healthy and reduce the risk for infections.

Preventive tips include:

  • Avoiding any perfumes, metals, harsh soaps, or irritants known to cause allergic reactions on the skin.
  • Wearing long sleeves and pants when hiking or going outdoors to reduce contact with irritating plants, as well as protecting against bug bites.
  • Wearing sunscreen when outdoors to protect the skin from sunburn and inflammation.
  • Avoiding excessively long showers or exposing the skin to water for an extended time.

A person can ask their doctor about other preventive tips depending on what is causing their rash.

Complications

If a rash that is hot to the touch is due to underlying infection, leaving it untreated could cause complications. Examples may include sepsis, which is a severe infection that affects the whole body and can be fatal.

A person can also experience scarring after a serious rash, which is why it is essential to avoid scratching and to stop the rash from worsening.


Takeaway

Rashes can range from those that are the result of chronic conditions, such as eczema, to those caused by acute exposure to an allergen.

While a rash being hot to touch can be a common symptom, a person should not ignore additional symptoms, such as a fever, significant pain, or difficulty breathing.

These symptoms require urgent medical attention.

Source Article from https://www.medicalnewstoday.com/articles/322442.php

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