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PostSubject: Beauty & Plastic Surgery Heat rash   Beauty & Plastic Surgery Heat rash EmptyTue Jan 04, 2011 5:04 am

Heat rash — also known as prickly heat
and miliaria — isn't just for babies. Though it's common in infants,
heat rash can affect adults too, especially during hot, humid weather.

Heat rash develops when your sweat ducts become blocked and perspiration
is trapped under your skin. Symptoms range from superficial blisters to
deep, red lumps. Some forms of heat rash can be intensely itchy or
prickly feeling.

Heat rash usually goes away on its own. Severe forms of heat rash may
need medical care, but the best way to relieve symptoms is to cool your
skin and prevent sweating.


Adults usually develop heat rash in skin folds and wherever clothing
causes friction. In infants, the rash is mainly found on the neck,
shoulders and chest, but it can also occur in the armpits, elbow creases
and groin.

There are three types of miliaria, which are classified according to
where the sweat ducts are blocked. Signs and symptoms for each type

Miliaria crystallina
The mildest form of heat rash affects the sweat ducts in the topmost layer of skin. Miliaria crystallina is marked by:

* Tiny, clear, superficial blisters and bumps (papules) that break easily

The blisters that occur with miliaria crystallina aren't itchy or
painful. This type of heat rash usually clears on its own but can come
back if hot, humid weather persists. And though it's common in newborns,
adults can develop it too.

Miliaria rubra
Occurring deeper in the outer layer of skin (epidermis), miliaria rubra
is sometimes called prickly heat. Adults usually develop miliaria rubra
after they're exposed to hot, humid weather or if they're confined to
bed rest. Infants usually develop this type of heat rash between the
first and third weeks of life. Signs and symptoms typically include:

* Red bumps
* Itchy or prickly feeling in the affected area
* Little or no sweating in the affected areas (anhidrosis)

Miliaria profunda
A less common form of heat rash, miliaria profunda occurs mainly in
adults who have had repeat bouts of miliaria rubra. It affects the
dermis, a deeper layer of skin, and appears soon after exercise or any
activity that causes sweating. Signs and symptoms may include:

* Firm, flesh-colored lesions that resemble goose bumps
* A lack of perspiration, which may lead to symptoms of heat exhaustion, such as dizziness, nausea and a rapid pulse

When to see a doctor
Heat rash usually heals on its own and doesn't require medical care. See
your doctor if you or your child has symptoms that last longer than a
few days, the rash seems to be getting worse, or there are signs of
infection such as:

* Increased pain, swelling, redness or warmth around the affected area
* Pus draining from the lesions
* Swollen lymph nodes in the armpit, neck or groin
* A fever or chills


Heat rash develops when some of your sweat ducts become clogged. Instead
of evaporating, perspiration remains trapped beneath the skin, causing
inflammation and rash.

It's not always clear why the sweat ducts become blocked, but certain factors seem to play a role, including:

* Immature sweat ducts. Because a newborn's sweat ducts aren't fully
developed, they can rupture more easily, trapping perspiration beneath
the skin. This usually happens in hot weather, but can occur anytime
infants are dressed too warmly. Newborns who have high fevers or are in
incubators can also develop blocked sweat ducts.
* Tropical climates. Hot, humid weather is particularly conducive to miliaria.
* Physical activity. Intense exercise, hard work or any activity
that causes you to perspire extensively can lead to heat rash.
* Certain fabrics. You may develop heat rash if you consistently
wear clothing that doesn't allow perspiration to evaporate normally.
* Medications. Certain prescription medications have been linked to
heat rash, including bethanechol (Urecholine), which treats bladder
problems; clonidine (Catapres), a high blood pressure drug sometimes
used to treat attention-deficit/hyperactivity disorder (ADHD); the acne
medication isotretinoin (Accutane); and doxorubicin (Adriamycin), a
chemotherapy drug.
* Overheating. Overheating in general — bundling up too much in
winter, sleeping under an electric blanket — can lead to heat rash.
* Heavy creams and ointments. These products can block the sweat ducts.

Heat rash can also occur in people who are confined to a hospital bed for long periods, especially if they have a fever.

Risk factors

Factors that make you more prone to heat rash include:

* Being a newborn. Though heat rash can affect anyone, newborns are most susceptible.
* Being in a tropical climate. People living in the tropics are far
more likely to have heat rash than are people in temperate climates.
* Participating in intense physical activities. Anything that makes
you sweat profusely, especially if you're not wearing moisture-wicking
clothing, can trigger heat rash.


Heat rash usually heals without problems, but complications sometimes occur, such as:

* Infection. Occasionally, heat rash becomes infected with bacteria,
causing inflamed and itchy pustules. This can occur in children in
diapers but shouldn't be confused with diaper rash, which results from
irritation to tender skin, not from blocked pores.
* Heat exhaustion. In hot weather, people with miliaria profunda are
at risk of heat exhaustion, because their sweat ducts are blocked. Heat
exhaustion can cause low blood pressure, dizziness, nausea, headache
and a rapid pulse. Untreated heat exhaustion can lead to heatstroke, a
life-threatening condition.

Preparing for your appointment

A doctor's appointment usually isn't necessary for heat rash, because
the rash generally clears up on its own. If your rash is more severe,
you may want to see your primary care doctor or a doctor who specializes
in skin disorders (dermatologist) to be sure it's heat rash and not
another skin disorder.

Before you go, it's a good idea to write down any questions you might
have so that you're sure to cover all of the points that are important
to you. For heat rash, some questions to ask your doctor include:

* What could have caused this rash to develop?
* Do I need any tests?
* How do I need to treat it?
* Do I need to limit physical activity until the rash clears up?
* What steps can I take to prevent it in the future?

Tests and diagnosis

No tests are needed to diagnose heat rash; your doctor can determine the problem with a visual exam.

Treatments and drugs

Reduce sweating
The best treatment for any form of heat rash is to reduce sweating by
staying in air-conditioned buildings or, when that's not possible, using
fans to circulate the air, wearing lightweight clothing made of fabrics
that "breathe" and limiting physical activity. Once skin is cool, heat
rash tends to clear quickly.

Mild heat rash doesn't require any other treatment.

Topical therapies
More-severe forms of heat rash may require topical therapies to relieve
discomfort and prevent complications. Topical treatments may include:

* Calamine lotion to soothe itching
* Anhydrous lanolin, which may help prevent duct blockage and stop new lesions from forming
* Topical steroids in the most serious cases

Lifestyle and home remedies

* In hot weather, dress in loose, lightweight clothing that wicks moisture away from your skin.
* Spend as much time as possible in air-conditioned buildings.
* After bathing, let your skin air-dry, instead of toweling off.
* Use calamine lotion or cool compresses to calm itchy, irritated skin.
* Avoid using creams and ointments, which can block pores further.

If you keep your skin cool and dry, heat rash will usually clear up in seven to 10 days.


To help protect yourself or your child from heat rash:

* In summer, dress in soft, lightweight, cotton clothing. And avoid
overdressing in winter — children should wear the same amount of
clothing that an adult would wear to stay comfortable.
* Avoid tightfitting clothes that can irritate tender skin.
* When it's hot, stay in the shade or in an air-conditioned building
or place a fan at a safe distance to gently circulate the air.
* Keep your sleeping area cool and well ventilated.
* Bathe in cool water with a nondrying soap that doesn't contain fragrances or dyes.
* Avoid using creams or ointments — they don't prevent heat rash and can block pores.
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