What are the types of skin allergy
Hives are an outbreak of swollen, pale red bumps that appear suddenly on the skin. These bumps are sometimes called wheals or welts, and they may be circular or irregular in shape and range in size from pin-size dots to large map-like patches.
They can appear anywhere on the body, including the face, lips, tongue, throat, or ears. Their edges are distinct, and the area of skin affected by the hive is smooth and elevated above the surrounding area of skin (reflecting the fluid collected in the layer of skin under the surface).
Angioedema is similar to hives, but the swelling occurs deeper within the skin instead of on the surface, so the swelling is more noticeable and worrying.
Occasionally, angioedema can be life-threatening, because the swelling can happen around the throat, tongue or lungs and restrict breathing. Other common areas affected by angioedema include the eyes, lips and sometimes the genitals, hands, or feet.
See your doctor as soon as possible if you develop angioedema.
Some wheals may glance diverse from others, for example, some may be red, whereas others may be pale; some may be rounded, whereas others may be flat on top. Hives are generally incredibly itchy and they characteristically change in size and shape and may join together to form larger areas known as plaques. Sometimes they vanish for a few hours only to reappear in a diverse formation later.
Most people ponder hives are caused by an allergy, but in fact, most cases of hives happen for non-allergic reasons, although allergies are a common cause.
Other causes of hives include:
- Certain foods: The most common foods implicated are nuts, chocolate, fish, tomatoes, eggs, unused berries, and milk. Unused foods cause hives more often than cooked foods
- Chemicals in certain foods (such as additives and preservatives)
- Blood transfusions
- Physical stimuli, such as pressure, freezing, heat, exercise or sun exposure
- Medications (such as aspirin, NSAIDs [eg, ibuprofen], ACE inhibitors, codeine, sulfa drugs)
- Infections (eg, colds, infectious mononucleosis, hepatitis, urinary tract infections, and strep throat)
- Insect bites or stings
- An underlying internal disease (such as thyroid disease, cancer, or hepatitis).
Hives (urticaria) are generally classified as acute (lasting less than six weeks) or chronic (lasting more than six weeks).
Some cases are mild, while others are severe. Scratching, alcoholic beverages, exercise, and stress may worsen hives.
The most frequently recommended treatment for hives is antihistamines. These work by blocking the effect of histamine, which is a chemical in the skin that can cause inflammation, swelling, and itching. Freezing compresses or anti-itch salves may also assist ease symptoms.
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
There are 2 types of contact dermatitis.
Irritant dermatitis: This is the most common type. It is not caused by an allergy, but rather the skin’s reaction to irritating substances or friction. Irritating substances may include acids, alkaline materials such as soaps and detergents, fabric softeners, solvents, or other chemicals. Extremely irritating chemicals may cause a reaction after just a short period of contact.
Milder chemicals can also cause a reaction after repeated contact.
People who own atopic dermatitis are at increased risk of developing irritant contact dermatitis.
Common materials that may irritate your skin include:
- Hair dyes
- Long-term exposure to wet diapers
- Pesticides or weed killers
- Rubber gloves
Allergic contact dermatitis: This form of the condition occurs when your skin comes in contact with a substance that causes you to own an allergic reaction.
Common allergens include:
- Balsam of Peru (used in numerous personal products and cosmetics, as well as in numerous foods and drinks).
- Antibiotics, such as neomycin rubbed on the surface of the skin.
- Adhesives, including those used for untrue eyelashes or toupees.
- Nickel or other metals (found in jewelry, watch straps, metal zips, bra hooks, buttons, pocketknives, lipstick holders, and powder compacts).
- Preservatives commonly used in prescription and over-the-counter topical medicines.
- Rubber or latex gloves or shoes.
- Fragrances in perfumes, cosmetics, soaps, and moisturizers.
- Poison ivy, poison oak, poison sumac, and other plants.
- Fabrics and clothing, including both materials and dyes.
- Nail polish, hair dyes, and permanent wave solutions.
- Formaldehyde, which is used in a wide number of manufactured items.
You will not own a reaction to a substance when you are first exposed to the substance. However, you will form a reaction after future exposures. You may become more sensitive and develop a reaction if you use it regularly.
It is possible to tolerate the substance for years or even decades before developing allergy. Once you develop an allergy you will be allergic for life.
The reaction most often occurs 24 to 48 hours after the exposure. The rash may persist for weeks after the exposure stops.
Some products cause a reaction only when the skin is also exposed to sunlight (photosensitivity). These include:
- Shaving lotions
- Sulfa ointments
- Some perfumes
- Coal tar products
- Oil from the skin of a lime
A few airborne allergens, such as ragweed, perfumes, vapor from nail lacquer, or insecticide spray, can also cause contact dermatitis.
Have you noticed that your skin is itchy or dry since starting dialysis? If so, you are not alone. Numerous dialysis patients own these issues.
It is called uremic pruritis. Itchy skin is diverse for everyone, and it can happen at any time of day, on any part of the body, and be a annoy for some more than others. Some dialysis patients tell they feel itchy in one area, and others feel itchy every over. What’s significant is trying to understand what may be causing it and finding the best way to manage it.
What causes dry, itchy skin?
A combination of things can cause your skin to be itchy and dry. Some issues are:
- Limited fluid intake: Your dialysis treatment removes additional water from your body, and your limited fluid intake between treatments can cause dry skin and trigger itchiness.
- Unmanaged phosphorous: Often, itching is caused by high blood levels of phosphorus.
In your body, additional phosphorus can bind with calcium and lead to feeling itchy. If your healthcare provider has given you phosphate binders, taking them as instructed, and at the same time every day, will help.
- Not enough dialysis: Talk to your healthcare team about your symptoms and discover out if you are getting the correct quantity of dialysis. Sometimes too much or too little dialysis can lead to symptoms love dry, itchy skin.
- Allergies and other causes: Be certain you are not sensitive to the soaps, laundry detergents, lotions, or perfumes you may be using.
Sometimes the dyes and fragrances in these products can cause allergic reactions that make skin itchy. Also, taking baths with water that is too boiling can leave your skin too dry and lead to itchy skin.
- Try to figure out what is causing the itching. Is it better at some times than others? What helps or makes it worse? Tell your healthcare team what changes you feel and see with your skin.
- Find a excellent skincare routine, with daily cleansing and moisturizing.
Enquire your healthcare team which moisturizers work best for your symptoms.
- Don’t scratch your skin! Scratching tends to make the itching worse, and may even damage the skin and lead to infection.
- Stick to the diet given to you by your healthcare team along with your phosphate binders.
The main difference between hives and a rash is that hives are a particular type of rash, characterized by swollen, pale-red or skin-colored bumps on the skin that appear and vanish quickly, and tend to “blanch” (which means turn white) when pressed. Hives are also known as urticaria.
Hives are a type of rash, but there are numerous other diverse ways rashes present.
Both hives and rashes tend to be itchy.
Main allergy symptoms
Common symptoms of an allergic reaction include:
- itchy, red, watering eyes (conjunctivitis)
- sneezing and an itchy, runny or blocked nose (allergic rhinitis)
- wheezing, chest tightness, shortness of breath and a cough
- swollen lips, tongue, eyes or face
- tummy pain, feeling ill, vomiting or diarrhoea
- a raised, itchy, red rash (hives)
- 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 is a rash?
A rash is an irritated area of skin. Most rashes are characterized by little bumps of skin, are itchy and glance red. Sometimes the skin may be broken from scratching.
In some types of rashes, blisters may form.
Rashes may be a symptom of an underlying medical problem and some people are more likely than others to develop rashes. Other common causes of rashes include:
- Chemical exposure
- Irritating substances
- Plants (eg, poison ivy)
- Medications (eg, amoxicillin, sulfa drugs)
- Insects, spiders, or jellyfish
Some rashes develop suddenly, whereas others form over several days. Treatments vary, depending on what caused the rash in the first put but may include moisturizers, lotions, corticosteroids creams (which relieve redness and swelling) and antihistamines (which relieve redness and itching).
If your rash doesn’t go away within a few days, you own other worrying symptoms, or is extremely severe, see your health care provider.
For numerous Australians, summer means outdoor activities.
Numerous people get sunburn during the summer months and sun safety is significant for every of us.
But aside from sunburn, some people may get other rashes.
These rashes can be caused by things love sunlight, insects, sweating and overheating during the summer months — especially if they own allergies and/or pre-existing skin conditions. Babies are especially susceptible to skin rashes because their skin is often more sensitive.
There are several diverse types of skin rashes; here are some that can happen during the summer months.
Heat rash or prickly heat
Heat rash or prickly heat is a harmless but extremely itchy skin rash forming little red spots in places where sweat collects, such as the armpits, back, under the breasts, chest, groin, crooks of elbows and knees, and the waist.
Heat rash is caused by a blockage and inflammation of sweat ducts in heat and high humidity, which causes:
- tiny red spots
- an irritating itch and prickling sensation
- redness and mild swelling of the affected area
Read more about how to manage in boiling weather.
Some people own skin that can develop rashes with exposure to direct sunlight including people on certain antibiotics, or people exposed to some chemicals, fragrances, dyes, or disinfectants.
This is called photodermatitis.
In some people exposure to the sun in the spring or early summer can trigger an itchy, red rash on the front of the neck, chest and the arms and thighs called polymorphous light eruption (PMLE).
It generally clears without treatment in a few days, although it can come back.
Sunlight can also trigger a rare condition called lupus (systemic lupus erythematosus or SLE) in susceptible people.
Check your symptoms with healthdirect’s Symptom Checker to get advice on when to seek medical attention.
Read more about sun safety.