Contact dermatitis
Reactions to metals, fragrances, plants, and products — often in a tell-tale pattern.
Medical Dermatology
Rashes & mystery skin issues
A rash that won't quit is more than annoying — it's a puzzle. Our job is to find the cause and treat the real problem, not just the symptom.
Overview
Understanding rashes
Rashes are one of the most common reasons patients search for answers at 2 a.m. They can come from allergens, irritants, infections, medications, or an underlying condition — and because so many rashes look alike, telling them apart is exactly what a dermatologist is trained to do.
Too often a stubborn rash gets treated by trial and error — one cream after another, without ever naming the cause. We take a different approach: a careful history, a close look at the pattern and location, and targeted testing when it's needed, so treatment is aimed at the real problem instead of chasing the symptom.
The rashes and reactions we sort out
“Rash” is a catch-all for many very different problems — and the right treatment depends entirely on which one you have:
- Irritant contact dermatitis — a reaction to something that physically irritates the skin, like harsh soaps, chemicals, or repeated friction.
- Allergic contact dermatitis — an immune reaction to an allergen such as nickel, fragrance, hair dye, or poison oak, often in a tell-tale pattern.
- Hives (urticaria) — itchy welts that come and go, sometimes for weeks at a time.
- Drug & allergic reactions — widespread rashes tied to a medication, food, or the environment.
- Autoimmune & inflammatory rashes — skin signs of conditions like lupus or dermatomyositis that need a precise diagnosis.
Getting to the exact trigger
When an allergy is driving a rash, guessing isn't good enough. Finding the precise culprit is what turns an endless flare into lasting relief:
- We start with a careful history and exam to identify likely triggers — the products, metals, or exposures behind the pattern we see.
- When formal allergy patch testing is the right next step, we'll guide you to it — sometimes in our office, and sometimes by coordinating with a trusted allergist for comprehensive panels.
- Patch testing applies small amounts of common allergens to the skin, then reads the reactions over several days to see what's responsible.
- The goal either way is the same: a personalized list of what to avoid, so flares become far less frequent.
Rashes & reactions we diagnose
What we look for
Hives (urticaria)
Itchy welts that come and go, sometimes chronically.
Allergic & drug reactions
Widespread rashes tied to foods, medications, or the environment.
Autoimmune rashes
Skin signs of underlying conditions that need proper diagnosis.
Unexplained persistent rashes
The stubborn, recurring rashes that other treatments haven't solved.
How we treat it
Your treatment options
Diagnosis first — then a plan aimed squarely at the cause.
Careful history & exam
We read the pattern, timing, and triggers of your rash to narrow down the cause.
Skin biopsy
A quick in-office sample when a rash needs a definitive diagnosis under the microscope.
Patch & allergy testing
Testing to pinpoint the metals, fragrances, or ingredients behind a contact reaction.
Targeted prescription treatment
Topical or oral medication matched to the exact diagnosis — not trial and error.
Trigger & irritant guidance
Clear direction on what to avoid so the rash settles and stays away.
Follow-up to confirm resolution
We check that the rash has truly cleared and adjust the plan if it returns.
When to see a dermatologist
If a rash is spreading, painful, blistering, or simply won't go away, don't keep guessing — get a diagnosis. Seek urgent care right away for a rash with fever, blistering across large areas, or any swelling of the lips, tongue, or trouble breathing.
Schedule with JuniperCommon questions
Rashes FAQ
Why won't my rash go away?
Rashes can come from allergens, irritants, infections, medications, or an underlying condition — and they can look alike. Lasting relief starts with the right diagnosis, which may take a careful history, an exam of the pattern and location, and sometimes a biopsy or patch testing. Once we know the cause, treatment is far more effective than trial and error.
Should I see a dermatologist or my primary care doctor for a rash?
For a rash that keeps returning, spreads, blisters, or hasn't responded to first-line care, a dermatologist is the specialist trained to identify the exact cause and treat it precisely. We use diagnostic tools — dermoscopy and skin biopsy — and coordinate allergy patch testing when it's needed, so we pinpoint what's really going on rather than treating blindly.
What is patch testing, and do I need it?
Patch testing is how the specific allergen behind an allergic rash is identified. Small amounts of common allergens are applied to the skin for about 48 hours, then read over several days, and you leave with a personalized list of what to avoid. Not every rash needs it — we'll tell you if it's the right step, and depending on the panel needed we may perform it here or coordinate with a trusted allergist for more comprehensive testing.
What's the difference between irritant and allergic contact dermatitis?
Irritant contact dermatitis is direct damage to the skin from something like harsh soaps, chemicals, or repeated friction. Allergic contact dermatitis is an immune reaction to a specific allergen — nickel, fragrance, hair dye, or poison oak, for example. They can look similar, but the treatment and the things you'll need to avoid are different, which is why an accurate diagnosis matters.
Is my rash contagious?
Many rashes — like contact dermatitis, hives, and eczema — are not contagious at all. Some, such as certain viral or fungal rashes, can spread. Because it's not always obvious which is which, an evaluation gives you a clear answer and the right precautions.
Can a rash be a sign of something more serious?
Sometimes. A rash can be the skin's signal of an internal or autoimmune condition, a drug reaction, or an infection. Part of our job is recognizing the patterns that warrant a closer look, so nothing important is missed.
Bend & Redmond · Central Oregon
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