Rashes

What Are Rashes?

A rash is a change in the skin’s texture or appearance that can include redness, swelling, bumps, flaking, or blistering. Rashes are not a diagnosis in themselves—they are a symptom that may result from various underlying conditions, such as:

• Infections (bacterial, viral, fungal, or parasitic)

• Allergic reactions (e.g. food, medication, pollen, or skincare products)

• Chronic skin conditions (e.g. eczema, psoriasis, contact dermatitis)

• Heat or sweat-related issues (e.g. heat rash)

• Autoimmune or systemic diseases (e.g. lupus)

Some rashes appear suddenly, while others develop over time. Understanding the pattern, location, duration, and associated symptoms is key to identifying the cause.

Common Causes of Rashes

1. Skin Infections

Rashes from infections often appear as red, inflamed, or crusted patches, sometimes with pus or oozing. Examples include:

• Impetigo (bacterial)

• Tinea (ringworm) (fungal)

• Viral exanthems (e.g. hand-foot-mouth disease)

2. Allergic Reactions

These rashes usually show up as itchy red bumps or hives, triggered by:

• Food allergies

• Medications (e.g. antibiotics, heart or blood pressure medications)

• Environmental allergens (e.g. dust mites, pollen, animal dander)

• Contact allergens (e.g. nickel, fragrances, rubber)

3. Eczema and Dermatitis

These are chronic or recurring rashes often triggered by genetics, irritants, or immune responses. They may present as:

• Dry, scaly patches

• Redness and itching

• Thickened skin in chronic cases

4. Heat and Sweat

In hot and humid climates like Singapore, blocked sweat glands can lead to heat rash (miliaria), presenting as small blisters or prickly red spots.

5. Medication Reactions

Certain medications may trigger drug-induced rashes, ranging from mild red patches to more serious reactions requiring urgent care.

How Are Rashes Diagnosed?

At Shine Dermatology, your dermatologist will:

• Take a detailed history of your symptoms, lifestyle, recent exposures, and medications

• Examine the rash closely, noting its pattern, distribution, and characteristics

• Order tests when necessary, such as:

• Skin scrapings or swabs (for infections)

• Blood tests (for autoimmune or systemic causes)

• Patch testing (for allergic contact dermatitis)

• Skin biopsy (for persistent or atypical rashes)

Accurate diagnosis is essential to avoid mistreatment, especially when different conditions mimic each other.

Rash Treatment Options at Shine Dermatology

Treatment depends on the underlying cause. Common options include:

Your dermatologist will guide you on the appropriate duration of treatment and follow-up to monitor response.

When to See a Dermatologist

You should consult a dermatologist if your rash is:

• Persistent or worsening

• Spreading rapidly

• Painful or blistering

• Associated with fever or other systemic symptoms

• Recurring or unclear in cause

Early intervention helps prevent complications like skin infections, scarring, or chronic skin damage.

FAQ – Rashes in Singapore

Q: Can I self-treat a rash with over-the-counter creams?
A: While mild rashes may respond to moisturisers or anti-itch creams, improper self-treatment may worsen the condition. It's best to consult a dermatologist if symptoms persist.

Q: How can I tell if my rash is an allergy or an infection?
A: Allergic rashes tend to be itchy and red without pus, while infections often involve swelling, warmth, and oozing. A dermatologist can distinguish between the two and advise appropriately.

Q: Are rashes contagious?
A: Some rashes caused by infections (like ringworm or impetigo) are contagious, while others (like eczema or allergies) are not.

Q: How long will it take for my rash to clear?
A: This depends on the cause and treatment. Some rashes improve in days, while others (like eczema or autoimmune rashes) require ongoing management.

Struggling with a persistent or unexplained rash?

Book a consultation with our dermatologists today and get expert help to identify the cause and start effective treatment.