What causes a skin rash allergy

Back rash may be accompanied by other symptoms, depending on the underlying disease, disorder or condition. Certain conditions that cause back rash may also involve other body systems.

Related localized symptoms that may happen along with back rash

Back rash may be accompanied by other localized symptoms including:

  1. Pus or discharge

  2. Itchiness

  3. Scale formation

  4. Bruising

  5. Redness, warmth or swelling

  6. Tenderness or pain

Other symptoms that may happen along with back rash

Back rash may accompany symptoms related to other body systems including:

Serious symptoms that might indicate a life-threatening condition

In some cases, back rash may be a symptom of a life-threatening condition that should be evaluated immediately in an emergency setting.

Seek immediate medical care (call 911) if you, or someone you are with, own back rash along with other serious symptoms including:

  1. Purple rash

  2. Fever and chills

  3. Tightness or constriction in the throat

  4. Joint pain and stiffness

  5. Respiratory or breathing problems, such as shortness of breath, difficulty breathing or inability to breathe, labored breathing, wheezing, or choking

  6. Sudden swelling of the face, lips or tongue

  7. Change in level of consciousness or alertness, such as passing out or unresponsiveness

  8. Worsening of symptoms despite treatment

Severe allergic reaction (anaphylaxis)

In rare cases, an allergy can lead to a severe allergic reaction, called anaphylaxis or anaphylactic shock, which can be life threatening.

This affects the whole body and usually develops within minutes of exposure to something you’re allergic to.

Signs of anaphylaxis include any of the symptoms above, as well as:

Anaphylaxis is a medical emergency that requires immediate treatment.

Read more about anaphylaxis for information about what to do if it occurs.

Sheet final reviewed: 22 November 2018
Next review due: 22 November 2021


Main allergy symptoms

Common symptoms of an allergic reaction include:

  1. wheezing, chest tightness, shortness of breath and a cough
  2. itchy, red, watering eyes (conjunctivitis)
  3. tummy pain, feeling ill, vomiting or diarrhoea
  4. sneezing and an itchy, runny or blocked nose (allergic rhinitis)
  5. swollen lips, tongue, eyes or face
  6. a raised, itchy, red rash (hives)
  7. dry, red and cracked skin

The symptoms vary depending on what you’re allergic to and how you come into contact with it.

For example, you may have a runny nose if exposed to pollen, develop a rash if you own a skin allergy, or feel sick if you eat something you’re allergic to.

See your GP if you or your kid might own had an allergic reaction to something. They can assist determine whether the symptoms are caused by an allergy or another condition.

Read more about diagnosing allergies.

What causes back rash?

Back rash may own numerous possible causes, including allergens (agents that cause allergies), infections, autoimmune disorders, or other causes such as stress.

Autoimmune causes of back rash

Back rash can also be caused by autoimmune disorders including:

  1. Kawasaki disease (rare, serious pediatric disorder characterized by inflammation of blood vessels, high fever, rash, and mucous membrane changes)
    Psoriasis (thick scaly plaques sitting atop a reddened base)
  2. Rheumatoid arthritis (chronic autoimmune disease characterized by joint inflammation)
  3. Systemic lupus erythematosus (disorder in which the body attacks its own healthy cells and tissues)

Infectious causes of back rash

Back rash can also be caused by infections including:

  1. Meningitis (infection or inflammation of the sac around the brain and spinal cord)
  2. Impetigo
  3. Scabies
  4. Lyme disease (inflammatory bacterial disease caused by ticks
  5. Pityriasis rosea (condition with possible viralorigin that causes an intensely itchy rash with «herald patch» on lower back)
  6. Rocky Mountain spotted fever
  7. Eczema (skin disorder causing scaly or blistering rashes that may be caused by infection)
  8. Ringworm
  9. Chickenpox or shingles
  10. Measles, mumps, rubella, roseola, and scarlet fever
  11. Strep throat (bacterial throat infection)

Serious or life-threatening causes of back rash

In some cases, back rash may be a symptom of a serious or life-threatening condition that should be evaluated immediately in an emergency setting.

These include:

  1. Allergic purpura
  2. Anaphylaxis (life-threatening allergic reaction)

Allergic or inflammatory causes of back rash

Arm rash may be caused by contact dermatitis. Common triggers include:

  1. Industrial chemicals, such as those found in elastic, latex and rubber
  2. Cosmetics, dyes, or detergents
  3. Metallic substances such as jewelry
  4. Poison ivy or oak

Other allergic causes of back rash include:

  1. Eczema (skin disorder causing scaly or blistering rashes that may be caused by allergy)
  2. Food allergies (allergic reactions to certain foods)
  3. Insect bite allergy such as a bee sting

Other causes of back rash

Back rash can be caused by other factors including:

  1. Medications
  2. Extreme freezing or heat
  3. Sunburn
  4. Acne
  5. Stress
  6. Wearing close-fitting clothes for an extended period of time (occlusive dermatitis)

Questions for diagnosing the cause of back rash

To diagnose your condition, your doctor or licensed health care practitioner will enquire you several questions related to your back rash including:

  1. Did the rash start in one location and spread to another?
  2. Are you taking any medications?
  3. Have you tried any new products recently, such as soaps, perfumes or sprays?
  4. Do you own allergies?
  5. Does the rash cause any itching or scaling?
  6. Do you feel otherwise healthy?
  7. When did the rash begin?
  8. Have you spent a lot of time outdoors lately?

What are the potential complications of back rash?

Because back rash may be due to serious diseases, failure to seek treatment can result in serious complications and permanent damage.

For example, infectious diseases, such as mumps or measles can lead to rare but serious complications, including miscarriage, hearing loss, and serious brain infections, such as encephalitis or meningitis. Lyme disease can progress to cognitive and functional impairments.

Once the underlying cause of your rash is diagnosed, it is significant for you to follow the treatment plan that you and your health care professional design specifically for you to reduce the risk of potential complications including:

  1. Meningitis (inflammation or inflammation of the sac around the brain and spinal cord)
  2. Encephalitis (inflammation and swelling of the brain due to a viral infection or other causes)
  3. Scarring and permanent disfigurement
  4. Cognitive difficulties
  5. Paralysis
  6. Permanent hearing loss
  7. Arthritis
  8. Miscarriage or stillbirth
  9. Secondary infections, which may develop from scratching and related skin trauma

What Causes Eczema?

Doctors don’t know exactly what causes eczema.

It might be that there’s a difference in the way a person’s immune system reacts to things. Skin allergies may be involved in some forms of eczema.

What Are the Signs & Symptoms of Eczema?

The signs of eczema (EK-zeh-ma):

  1. include redness, scales, and bumps that can leak fluid and then crust over
  2. are mainly dry, itchy skin. Because it is so itchy, it is often called «the itch that rashes.»
  3. tend to come and go. When they get worse, it is called a flare-up.
  4. may be more noticeable at night

Symptoms can vary:

  1. Infants younger than 1 year ancient generally own the eczema rash on their cheeks, forehead, or scalp.

    What causes a skin rash allergy

    It may spread to the knees, elbows, and trunk (but not generally the diaper area).

  2. Older kids and teensusually get the rash in the bends of the elbows, behind the knees, on the neck, or on the inner wrists and ankles. Their skin is often scalier and drier than when the eczema first began. It also can be thicker, darker, or scarred from every the scratching (called lichenification).

When Should I Call the Doctor?

Children and teens with eczema are prone to skin infections.

Call your doctor correct away if you notice any early signs of skin infection, such as

  1. redness and warmth on or around affected areas
  2. fever
  3. pus-filled bumps on or around affected areas
  4. areas on the skin that glance love freezing sores or fever blisters

Also call your doctor if you notice a sudden change or worsening of the eczema, or if it isn’t responding to the doctor’s recommendations.

What Is Eczema?

Eczema is a condition where the skin gets irritated, red, dry, bumpy, and itchy.

There are several types of eczema, but the most common is atopic dermatitis. To numerous people, «eczema» and «atopic dermatitis» mean the same thing.

How Is Eczema Treated?

There is no cure for eczema. But treatments can assist with symptoms. The doctor will recommend diverse treatments based on how severe the symptoms are, the child’s age, and where the rash is.

What causes a skin rash allergy

Some are «topical» and applied to the skin. Others are taken by mouth.

Topical moisturizers. Skin should be moisturized often (ideally, two or three times a day). The best time to apply moisturizer is after a bath or shower, with the skin patted dry gently. Ointments (such as petroleum jelly) and creams are best because they contain a lot of oil. Lotions own too much water to be helpful.

Topical corticosteroids, also called cortisone or steroid creams or ointments.

These ease skin inflammation. (These aren’t the same as steroids used by some athletes.) It’s significant not to use a topical steroid prescribed for someone else.

What causes a skin rash allergy

These creams and ointments vary in strength, and using the incorrect strength in sensitive areas can damage the skin, especially in infants.

Other topical anti-inflammatory medicines. These include medicines that change the way the skin’s immune system reacts.

Medicine taken by mouth. These can include antihistamines (anti-allergy medicine) to assist itchy kids sleep better at night, antibiotics if a rash gets infected by bacteria, and corticosteroid pills or other medicines that suppress the immune system.

Other types of treatment can include:

  1. phototherapy: treatment with ultraviolet light
  2. wet wraps: damp cloths placed on irritated areas of skin
  3. bleach baths: bathing in extremely diluted bleach solution

How Can Parents Help?

Help prevent or treat eczema by keeping your child’s skin from getting dry or itchy and avoiding triggers that cause flare-ups.

Attempt these suggestions:

  1. Keep your child’s fingernails short to prevent skin damage from scratching. Attempt having your kid wear comfortable, light gloves to bed if scratching at night is a problem.
  2. Ask your doctor if it’s OK to use oatmeal soaking products in the bath to assist control itching.
  3. Get rid of known allergens in your household and assist your kid avoid others, love pollen, mold, and tobacco smoke.
  4. Kids should wear soft clothes that «breathe,» such as those made from cotton. Wool or polyester may be too harsh or irritating.
  5. Kids should avoid becoming overheated, which can lead to flare-ups.
  6. Kids should drink plenty of water, which adds moisture to the skin.
  7. Kids should take short baths or showers in warm (not hot) water.

    What causes a skin rash allergy

    Use mild unscented soaps or non-soap cleansers and pat the skin dry before putting on cream or ointment. Teens should use unscented makeup and oil-free facial moisturizers.

  8. Stress can make eczema worse. Assist your kid discover ways to deal with stress (like exercise, deep breathing, or talking to a counselor).

Who Gets Eczema?

Many kids and teens with eczema own family members who own it. Experts ponder it passes from parents to kids throughgenes. Eczema is fairly common.

People with eczema also may own asthma and some types of allergies, such as hay fever.

Eczema, asthma, and hay fever are known as «atopic» conditions. These affect people who are overly sensitive to allergens in the environment. For some, food allergies may bring these on or make them worse. For others, allergies to animal dander, dust, pollen or other things might be the triggers.

Eczema is not contagious.

How Is Eczema Diagnosed?

There is no specific test used to diagnose eczema. The doctor will glance at the rash and enquire about symptoms, the child’s past health, and the family’s health. If family members own any atopic conditions, that’s an significant clue.

The doctor will law out other conditions that can cause skin inflammation, and might recommend that your kid see a dermatologist or an allergist.

The doctor may enquire you to ban some foods (such as eggs, milk, soy, or nuts) from your child’s diet, switch detergents or soaps, or make other changes for a time to see if your kid is reacting to something.

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Medical Reviewers: William C. Lloyd IIILast Review Date: 2018 Dec 2

© 2019Healthgrades Operating Company, Inc.The content on Healthgrades does not provide medical advice. Always consult a medical provider for diagnosis and treatment. Every rights reserved. May not be reproduced or reprinted without permission from Healthgrades Operating Company, Inc. Use of this information is governed by the Healthgrades User Agreement.

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What Else Should I Know?

For numerous kids, eczema begins to improve by the age of 5 or 6.

Sometimes it goes away. In other kids, it may start again as they enter puberty.

What causes a skin rash allergy

Some people still own eczema as adults, with areas of itching that glance dry and scaly.

What is back rash?

Rash is a symptom that causes the affected area of skin to turn red and blotchy and to swell. The rash may cause spots that are bumpy, scaly, flaky, or filled with pus. Rashes can vary in location, pattern and extent and may happen in any area of the body. A back rash can own a variety of causes, and it may indicate something occurring around the back itself or propose a systemic (body-wide) condition.

Contact dermatitis (skin inflammation) is caused by an adverse reaction to something that touches the skin, including chemicals found in detergent, soap or a perfume.

For example, you may develop a rash on your back when you wear a shirt that was washed with a specific detergent or treated with a chemical. Metal, such as in jewelry, can also cause back rash. Other forms of contact dermatitis include exposure to certain plants, such as poison oak or ivy, an animal bite, or an insect sting. Lyme disease is caused by tick bite, which can first appear as a circle with a bull’s-eye pattern, then progress to a rash.

Allergies to food and medications are potentially serious sources of rash.

What causes a skin rash allergy

Peanuts, shellfish, strawberries and avocados are just some of the foods that can trigger allergic reactions. These foods may cause mild reactions; however, in some cases, reactions could develop into potentially life-threatening conditions characterized by vomiting, difficulty breathing, or swelling. Allergic purpura is a serious, often life-threatening allergic reaction that can cause a skin rash but can also affect the joints, gastrointestinal tract, and kidneys.

Rashes may also be associated with skin conditions, such as eczema, psoriasis and impetigo.

Some of these are chronic skin conditions that may flare up for a time, then resolve. Other causes for rash include autoimmune disorders that happen when the body is attacked by its own immune system, which normally serves to protect it from foreign invaders (antigens). Numerous viruses that happen during flu season, or those associated with childhood diseases, such as chickenpox or measles, can produce rash.

Rashes can be caused by an allergic reaction to food, medications, lotions or detergents. These reactions can range from mild to potentially life threatening, especially if swelling and constriction of breathing occurs, which could indicate anaphylaxis.

Seek immediate medical care (call 911) if a rash is accompanied by any of the following symptoms, including swelling of the face, swelling and constriction of the throat, difficulty breathing, fainting, change in level of consciousness or alertness, pale skin, or purple rash.

Seek immediate medical care if a rash is persistent and causes you concern.