Lists common causes of skin rashes in those 12 and older. Covers allergies, chronic skin problems like eczema, or contact with poisonous plants like poison oak. Covers home treatment. Includes interactive tool to help you decide when to call a doctor.
Rash, Age 12 and Older
Healthy skin provides a barrier between the inside of the body and
the outside environment. A rash means some change has affected the skin.
Rashes are generally caused by skin irritation, which can have many
causes. A rash is generally a minor problem that may go away with home
treatment. In some cases a rash does not go away or the skin may become so
irritated that medical care is needed.
In adults and older
children, rashes are often caused by contact with a substance that irritates
the skin (contact dermatitis). The rash usually starts within 48
hours after contact with the irritating substance. Contact dermatitis may cause
mild redness of the skin or a rash of small red bumps. A more severe reaction
may cause swelling, redness, and larger blisters. The location of the rash may
give you a clue about the cause.
Contact dermatitis does not always
occur the first time you are in contact with the irritating substance (allergen). After you have had a reaction to the
substance, a rash can occur in response to even very small amounts of the
substance. Contact dermatitis is not serious, but it is often very itchy.
Common causes of contact dermatitis include:
detergents, shampoos, perfumes, cosmetics, or lotions.
New tools, toys, appliances, or other
Latex. Allergy to natural rubber latex affects people
who are exposed to rubber products on a regular basis, especially health care
workers, rubber industry workers, and people who have had multiple surgeries.
Latex allergies can cause a severe reaction.
Rashes may occur with viral infections, such as
herpes zoster; fungal infections, such as a yeast
infection (Candida albicans); bacterial infections, such
sexually transmitted infections (STIs). Rashes may also
occur as a symptom of a more serious disease, such as liver disease, kidney
disease, or some types of cancer.
Rashes may also appear
after exposure to an insect or a parasite, such as the
scabies mite. You may develop a rash when you travel
to a rural area or go hiking or camping in the woods.
A rash may
be a sign of a chronic skin problem, such as
seborrheic dermatitis. Other causes of rash include
dry, cold weather; extremely hot weather (heat rash); and emotional stress.
Emotions such as frustration or embarrassment may lead to an itchy rash.
Some medicines can cause a rash as a side effect. A very
rare and serious type of generalized red rash called toxic epidermal necrolysis
(TEN) may occur after using sulfa drugs. TEN can cause the skin to peel away, leaving large areas of tissue
that weep or ooze fluid like a severe burn. TEN may occur after the use of some
medicines. If this type of rash occurs, you
need to see a doctor.
The need for medical treatment often depends on what other
symptoms are present. A rash that occurs with other symptoms, such as shortness
of breath or fever, may mean another problem, such as a serious
allergic reaction or infection.
Symptoms of a severe allergic reaction
(anaphylaxis) may include:
The sudden appearance of raised, red areas (hives)
all over the body.
Rapid swelling of the throat, mouth, or tongue.
Passing out (losing consciousness). Or you may feel very lightheaded or suddenly feel weak, confused,
A severe reaction can be life-threatening. If you have had a
bad allergic reaction to a substance before and are exposed to it again, treat
any symptoms as an emergency. Even if the symptoms are mild at first, they may
quickly become very severe.
Many prescription and nonprescription medicines can cause a
rash. A few common examples are:
Aspirin, ibuprofen (Advil,
Motrin), and naproxen (Aleve).
Pain medicines, such as
Shock is a life-threatening condition that may quickly occur
after a sudden illness or injury.
Symptoms of shock (most of which will be present) include:
Feeling very dizzy or
lightheaded, like you may pass out.
Feeling very weak or having
Not feeling alert or able to think clearly. You
may be confused, restless, fearful, or unable to respond to questions.
Symptoms of infection may
Increased pain, swelling, warmth, or redness in or
around the area.
Red streaks leading from the area.
Pus draining from the area.
Symptoms of serious illness may
A severe headache.
Mental changes, such as feeling confused or much less
Extreme fatigue (to the point where it's hard for you to
Abnormal bleeding means any heavy or
frequent bleeding or any bleeding that is not normal for you. Examples of
abnormal bleeding include:
Vaginal bleeding that is
different (heavier, more frequent, at a different time of month) than what you
are used to.
Rectal bleeding and bloody stools.
or pink urine.
Gums that bleed easily when you eat or gently brush
When you have abnormal bleeding in one area of your body, it's
important to think about whether you have been bleeding anywhere else. This can
be a symptom of a more serious health problem.
Temperature varies a little depending on how you measure it.
For adults and children age 12 and older, these are the ranges for high,
moderate, and mild, according to how you took the temperature.
Oral (by mouth) temperature
104°F (40°C) and
100.4°F (38°C) to
100.3°F (37.9°C) and
Ear or rectal temperature
105°F (40.6°C) and
101.4°F (38.6°C) to
101.3°F (38.5°C) and
Armpit (axillary) temperature
High: 103°F (39.5°C) and higher
99.4°F (37.4°C) to
Mild: 99.3°F (37.3°C) and lower
If you're not sure if a fever is high, moderate, or mild,
think about these issues:
With a high fever:
You feel very hot.
It is likely one of
the highest fevers you've ever had. High fevers are not that common, especially
With a moderate fever:
You feel warm or hot.
You know you have
With a mild fever:
You may feel a little warm.
you might have a fever, but you're not sure.
Sudden tiny red or purple spots or
sudden bruising may be early symptoms of a serious
illness or bleeding problem. There are two types.
Petechiae (say "puh-TEE-kee-eye"):
Are tiny, flat red or purple spots in the skin or
the lining of the mouth.
Do not turn white when you press on
Range from the size of a pinpoint to the size of a small pea and do not itch or cause pain.
May spread over a large area of the body within a few hours.
Are different than tiny, flat red spots or birthmarks that are
present all the time.
Purpura (say "PURR-pyuh-ruh" or “PURR-puh-ruh”):
Is sudden, severe bruising that occurs for no clear
May be in one area or all over.
than the bruising that happens after you bump into something.
Many things can affect how your body responds to a symptom and what kind
of care you may need. These include:
Your age. Babies and older
adults tend to get sicker quicker.
Your overall health. If you have a condition such as diabetes, HIV, cancer, or heart
disease, you may need to pay closer attention to certain symptoms and seek care
Medicines you take. Certain
medicines, herbal remedies, and supplements can cause symptoms or make them
Recent health events, such as surgery
or injury. These kinds of events can cause symptoms afterwards or make them
Your health habits and lifestyle, such as eating and exercise habits, smoking, alcohol or drug
use, sexual history, and travel.
Try Home Treatment
You have answered all the questions. Based on your answers, you may be
able to take care of this problem at home.
Try home treatment to relieve the
Call your doctor if symptoms get worse or you have any
concerns (for example, if symptoms are not getting better as you would expect).
You may need care sooner.
Certain health conditions and medicines weaken the immune system's ability to fight off infection and
illness. Some examples in adults are:
Diseases such as diabetes, cancer, heart disease,
Long-term alcohol and drug
Steroid medicines, which may be used to treat a variety
Chemotherapy and radiation therapy for
Other medicines used to treat autoimmune
Medicines taken after organ transplant.
having a spleen.
Most rashes will go away without
medical treatment. Home treatment can often relieve pain and itching until the
rash goes away.
If you have come in contact with a substance such
poison ivy, oak, or sumac, immediately wash the area
with large amounts of water.
After a rash has developed, leave it
alone as much as possible.
Use soap and water sparingly.
the rash exposed to the air whenever possible.
Do not scratch the
If you have a rash, you should not be in contact with children
or pregnant women. Most viral illnesses that cause a rash are contagious,
especially if a fever is present.
Relief from itching
Keep the itchy area cool and moist. Put cloths
soaked in ice water on the rash a few times a day. Too much wetting and drying
will dry the skin, which can increase itching.
Keep cool, and stay
out of the sun. Heat makes itching worse.
Try an oatmeal bath to
help relieve itching. Wrap 1 cup of oatmeal in
a cotton cloth or sock and boil as you would to cook it. Allow it to cool to
room temperature, and use it as a sponge and bathe in cool water without soap.
You may also buy a product at the store, such as Aveeno Colloidal Oatmeal bath.
as much as possible. Scratching leads to more scratching. Cut nails short or
wear cotton gloves at night to prevent scratching.
clothing. Do not wear wool and synthetic fabrics next to your
Use gentle soaps, such as Basis, Cetaphil, Dove, or Oil of
Olay, and use as little soap as possible. Do not use deodorant
Wash your clothes with a mild soap, such as CheerFree or
Ecover, rather than a detergent. Rinse twice to remove all traces of the soap.
Do not use strong detergents.
Take several breaks during the day to do a relaxation exercise,
particularly before going to bed if stress appears to cause your itching or
make it worse. Sit or lie down, and try to clear your mind. Managing your stress by
relaxing every muscle in your body, starting with your toes and going up to
your head, may help your symptoms.
Nonprescription medicines for itching
and follow all label directions on the medicine bottle or box.
Try calamine lotion for a rash caused by
contact dermatitis, such as poison ivy or poison oak
For severe itching from contact dermatitis, apply
hydrocortisone cream 4 times a day until the itch is gone.
Do not use this cream on a fungal rash, because this can make the rash worse.
Try an oral
antihistamine to help the scratch-itch cycle. Examples
include chlorpheniramine maleate, such as Chlor-Trimeton, and diphenhydramine,
such as Benadryl. Oral antihistamines are helpful when itching and discomfort
are preventing you from doing normal activities, such as work and sleep.
Antihistamines may cause drowsiness. Do not drive or operate any type of
equipment if you are taking any of these medicines. And don't give
antihistamines to your child unless you've checked with the doctor first.
Medicine you can buy without a prescription
Try a nonprescription
medicine to help treat your fever or pain:
Aspirin (also a nonsteroidal
anti-inflammatory drug), such as Bayer or Bufferin
Talk to your child’s doctor before switching back and
forth between doses of acetaminophen and ibuprofen. When you switch between two
medicines, there is a chance your child will get too much medicine.
Be sure to follow these
safety tips when you use a nonprescription medicine:
Carefully read and follow all directions
on the medicine bottle and box.
How this information was developed to help you make better health decisions.