Rashes and Skin Allergies
A rash that appears suddenly, swelling, an itchy numbness after food, medication or an insect bite. Some of these are emergencies. The clinic is open 24 hours.
Quick answer
A sudden rash can come from many causes: food, medication, insect bites, something you touched, or an infection. Most settle with simple treatment. But a rash that comes with facial swelling, tongue swelling, breathlessness, dizziness or vomiting is an emergency and needs to be brought in straight away, not held until morning. This clinic is open 24 hours a day for exactly this reason.
Signs to bring in straight away
Swelling of the face, tongue or lips
This is an emergency. Do not wait, and do not drive yourself if it can be avoided. Come straight in or call 999.
Breathlessness or a change in the voice
Breathlessness, wheezing or a voice turning hoarse along with a rash are signs the airway is involved.
Dizziness or feeling faint
A rash with dizziness, a fast heartbeat or a feeling that you are about to pass out needs to be assessed immediately.
A rash after starting a new medication
A rash within a few days of starting an antibiotic or any new medication should be checked before the next dose is taken.
A rash with a high fever
The combination of rash and fever can point to an infection that needs assessing, not simply an allergy.
A rash that hurts rather than itches
A rash that is more painful than itchy, or that blisters, is a different pattern and should be examined.
The kinds of rash usually brought to the clinic
An itchy rash that comes up as red welts moving from place to place, which people know as hives, is usually an allergic reaction or a reaction after an infection. It can come and go within a few hours, and often there is no cause that can be identified with certainty.
A rash that appears only where something has been in contact with the skin, such as on the wrist from a watch, or where a cleaning agent has touched, is contact dermatitis. This is identified from the shape and the location of the rash.
A rash after an insect bite is common in this area, and some people react far more strongly than others. A bite that becomes a large swelling, hot and increasingly painful after a day or two may already be infected with bacteria.
A drug rash is an important reason not to ignore a new rash. If you started a medication within two weeks before the rash appeared, bring that list of medication with you.
Why the cause of an allergy often cannot be pinned down
This is the question asked most often, and the honest answer is that in many cases the cause cannot be identified with certainty.
For a reaction that happens within minutes of something specific, such as after eating prawns or after a single injection, the link is usually clear. For hives that come and go over weeks, the cause is often never found, and in some people it settles on its own after a few weeks or months.
Allergy testing is useful in specific situations, particularly where there is one clear suspect and the result will change a treatment decision. Running tests widely without a suspect often produces positive results that mean nothing in real life, and leads people to cut out foods for no reason.
The doctor will speak plainly about this, and will not promise an answer that cannot be given.
What helps while you wait
This is for an itchy rash with no emergency signs. If any of the emergency signs above are present, come straight in.
- Stop using any suspected new product or substance, and write down what was used
- Bathe in warm water, not hot water, because heat adds to the itch
- A cool compress on the itchy area
- Avoid scratching, keep nails short
- Take a photo of the rash while it is at its worst, because rashes have often gone by the time you reach the clinic
- Do not take a second dose of a suspected medication before discussing it with the doctor
What happens when you come in
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1
Register at the counterBring your identity card. If you are using an employer or insurance panel, tell the staff at the counter so they can check your eligibility first.
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2
The doctor examines your skinThe doctor looks at the affected area, asks how long it has been there, what you have already tried, and whether anyone else in the house has the same thing.
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3
Diagnosis and treatment optionsThe doctor explains what they see and the options available. If further tests are needed, that is explained before anything is done.
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4
Treatment and follow-upMedication is given with clear instructions. If the condition needs monitoring, the doctor tells you when to come back and what signs to watch for.
An ordinary rash compared with an emergency
| Point | Can wait for a convenient time | Come straight in |
|---|---|---|
| Breathing | Normal | Breathless, wheezing or a hoarse voice |
| Swelling | Only on the skin that has the rash | Face, lips, tongue or eyelids |
| General condition | Apart from the itch, feeling well | Dizzy, weak, vomiting or a fast heartbeat |
| Fever | None | High fever along with the rash |
| History | No strong reaction before | Previous anaphylaxis or carries an adrenaline pen |
This table is general information to help you choose. It is not a price offer.
Common questions
Are hives dangerous?
Hives on the skin alone are usually not dangerous even though they are distressing. They become an emergency when they come with swelling of the face or tongue, breathlessness, or a feeling that you are about to pass out.
Do I need allergy testing?
Not for most cases. It is useful when there is a clear suspect and the result will change the treatment. The doctor will suggest it if it is relevant, and will explain its limits.
My rash came at night, is the clinic open?
Yes. The clinic is open 24 hours a day including public holidays. For a rash with any emergency sign, come straight in rather than waiting for morning.
Can I take an allergy medication I have at home?
If it is a medication that was given to you before for the same condition and you have no emergency signs, it may help in the meantime. For a rash that is new or worse than usual, come and be seen.
A rash after an antibiotic, should I stop the medication?
Do not stop or continue without asking. Some drug rashes are mild, some are serious. Call the clinic or come in so the doctor can assess before the next dose.
My child has a rash after a fever. Is that normal?
Several childhood viral infections do produce a rash after the fever settles. But a rash with a fever should be checked once to make sure it is not something else.
An insect bite has swollen up badly. Do I need an antibiotic?
Not necessarily. A large swelling can simply be a strong reaction. The signs of infection are an area that becomes redder, hotter and more painful after a day or two, or that discharges pus. The doctor will assess.
What should I bring?
The list of medication you are taking, any new products you have used, and a photo of the rash while it was bad. Rashes have often gone by the time you reach the counter.
Send a message and clinic staff will answer. If you need to be examined, just come in. No appointment needed.
WhatsApp the clinicReferences
These are general medical references, not a diagnosis of your own condition. A doctor needs to examine the skin itself.
Come when you need to
No. 47 dan 49 (Tingkat Bawah), Jalan 2/1, Taman Seri Jaromas, 42600 Jenjarom, Selangor
Open 24 hours every day, including public holidays. No appointment needed.
The information on this page is for general education. It is not a substitute for examination, diagnosis or medical advice. Every case is different. See a doctor for an assessment of your own situation.