How should I take photos?

Record the time it first appeared and the time it disappeared, and take both photos of the overall distribution and close-up photos of the skin surface.

Are photos of rashes that have already disappeared helpful for the medical evaluation?

Yes. It becomes important data if the time it appeared, the time it disappeared, and the overall distribution are all recorded.

Skin Disease Treatment Guide

Distinguishing between rashes that disappear within a few hours and dermatitis that lasts for several days

Name: Distinguishing between rashes that disappear within a few hours and dermatitis that lasts for several days
Published: 2026-08-25

occurring in the same spot swellingFirst, observe whether it generally fades without leaving a mark within a day, or whether it stays for several days while leaving dead skin, discharge, or scabs. Wheals that disappear and reappear in different locations suggest hives, while long-lasting surface changes suggest other types of dermatitis, but a diagnosis requires looking at the overall progression.

Click on unfamiliar terms to see their meanings immediately.

Reviewed by Korean Medicine Doctor Choi Yeon-seung · Last updated 2026-08-25

Please record whether it remained in the same spot for a few hours or a few days

Mark the time the new rash appeared and the time it faded. You must separately record how many months the overall symptoms have been recurring and how many hours a single rash lasts.

Observe the appearance left on the skin, such as dead skin or discharge

While wheals are primarily characterized by a swollen appearance, eczema may leave dead skin, discharge, cracking, and scratch marks. Psoriasis is characterized by thick plaques with relatively distinct borders and scalesthese can serve as clues.

Please record how it changes when pressed or scratched

Observe whether it appears after being pressed or rubbed, or after exposure to hot or cold air. If it swells along the line of a scratch, it is helpful to take a photo of that appearance and the time.

If you experience shortness of breath, swelling, or fever, medical evaluation takes priority over comparison

If you have difficulty breathing, swelling of the lips or tongue, high fever and pain, or if the area around the eyes worsens rapidly, do not wait while comparing the condition yourself; seek medical evaluation immediately.

Check once more before your appointment

Check whether the same rash lasts for a few hours or a few days

Saying that rashes have been appearing for several days is different from saying the same spot has remained for several days. You must look at both the time it takes for a skin change in one spot to disappear and the appearance of the surface.

Take photos of the same spot in the morning and evening

Swollen marks like hives usually disappear as they move to different locations, but broad, flat skin changes or dead skin may remain in the same spot longer. Please separately record the total duration the rashes have been appearing and the time a single spot remained.

Take photos of the same area in the morning and evening to compare them.

Please take close-up photos so that dead skin, blisters, oozing, or scabs are visible.

Check if the color fades when pressed. While a diagnosis cannot be confirmed by photos alone, they help determine what to differentiate first during a medical evaluation.

Keep both a photo of the overall location and a close-up photo of the skin.

Do not delay if systemic symptoms occur

If you experience difficulty breathing, swelling of the lips or tongue, high fever, or rapid spreading accompanied by pain, you should seek medical evaluation promptly rather than continuing to monitor the duration.

For emergency symptoms, please seek help from 119 or an emergency room.

What to record in the rash timeline

Time of first appearance
Time when the same area faded
Dead skin, blisters,oozing Same surface
Changes after medication, food, heat, or pressure

You can check the simple meaning first before proceeding to the detailed explanation

Skin Terms to Know in This Guide

WhealA wheal is a raised area that looks like a mosquito bite; a key clue is that the same lesion fades within a relatively short period of time.Plaque-like lesionIn dermatology, a plaque lesion refers to a lesion that is broadly raised with visible borders. Psoriatic plaques, where scales accumulate on a red base, are representative, but this shape itself does not automatically mean it is psoriasis.ScalingScaling (squama) refers to the dead skin cells that peel off the skin surface in white, silvery, or yellowish colors. We examine the color, thickness, degree of adherence, and the borders of the lesion together.Lesion DistributionWhen describing the distribution, please explain not only "where it appeared," but also whether it is symmetrical on both sides, if it is in skin-fold areas, or if it follows areas exposed to sunlight, cosmetics, or clothing.

When herbal medicine treatment is the primary focus

We set the goals for herbal medicine treatment based on your previous treatments and when symptoms recurred

If skin symptoms persist or recur despite receiving necessary tests and treatments, and if this disrupts your sleep or daily life, we can plan a treatment centered on herbal medicine after reviewing your current skin changes and response to previous treatments.

Before the consultation

We ask where it appeared and when it worsened again

We examine the appearance and location of the skin lesions, the timing of flare-ups, and the response to medications used, along with overall bodily conditions that change simultaneously, such as sleep, digestion, and fatigue.

During treatment

We check if not only the itching, but also sleep and daily life are improving

In addition to visible changes in photos, we check the level of itching and pain, the frequency of waking up during the night, the interval between new skin changes, and your recovery of daily functioning.

Treatment sequence

We set the goals for herbal medicine treatment by identifying the problems that need to be resolved first

If there are causes that require immediate priority, such as infection or rapid worsening, those treatments come first. Subsequently, for herbal medicine treatment, we determine the primary goal of recovery by examining current discomfort, recurring patterns, sleep, digestion, and fatigue, and coordinate the sequence with necessary dermatological treatments.

While reducing aggravating factors through lifestyle management, herbal medicine treatment determines the initial target by analyzing the pattern of lesions, sleep, digestion, and fatigue through pattern identification (Byeonjeung). Necessary skin treatments are continued in accordance with the progress.

Consult about treatment

Frequently Asked Questions

Frequently Asked Questions Before Your Visit

If it disappears within a day, is it always hives?

It is a typical clue, but that alone is not used for confirmation. We also consider medication use, triggering stimuli, changes when pressed, and accompanying symptoms.

How should I take the photos?

Record the time of first appearance and the time of disappearance, and keep both photos of the overall distribution and close-ups of the surface.

Are photos of a rash that has already disappeared helpful for the medical evaluation?

Yes. If the time of appearance, time of disappearance, and overall distribution are all recorded, it becomes important data.

Can I check if it turns white when pressed?

You may check lightly, but this alone does not confirm a disease. If there is pain, fever, or rapid spreading, a direct medical evaluation takes priority.

Conditions and Guidance Related to My Symptoms

Condition GuidanceUrticariaThe representative symptom of urticaria (hives) is itchy wheals that suddenly appear. They may appear as round bumps, wide plaques, or linear shapes and can merge together; depending on skin tone, they may look red, pink, or similar to the surrounding skin color. A single wheal usually disappears within a day, but new skin changes appear in other locations, making the rash feel as if it is moving. In addition to itching, it may sting or burn, and angioedema, swelling of deeper skin layers such as the eyelids, lips, hands, and feet, may accompany it. Swelling of the face, mouth, tongue, or throat, difficulty breathing or swallowing, dizziness, or a feeling of fainting require immediate emergency assistance.Condition GuidanceEczemaCommon symptoms of eczema include dry, severely itchy skin and rashes. These can occur on the face, inside the elbows, behind the knees, and on the hands and feet; depending on skin tone, they may appear red, brown, purple, or gray, or present as prominent rough bumps. Scratching leads to more swelling and itching, and may cause scratch marks, scaling, cracking, blisters, oozing, or scabs. Prolonged scratching causes the skin to thicken and crack. If you experience unusual pain, heat, yellow scabs, or if clustered blisters are accompanied by fever and fatigue, promptly evaluate for the possibility of infection or herpetic eczema.Condition GuidancePsoriasisCommon symptoms of psoriasis include thick, raised inflammatory plaques and silvery-white scales on the scalp, elbows, knees, torso, palms, and soles. The skin may feel itchy, burning, stinging, or tight, and may crack dryly and bleed. Depending on the type, it may appear as small droplet-shaped skin changes, smooth rashes in skin folds, pustular skin changes on the hands and feet, or severe redness and scaling across the entire body. This may be accompanied by small pits, thickening, or crumbling of the fingernails and toenails, as well as joint pain, swelling, morning stiffness, and heel pain. If the entire body suddenly turns red, or if pustular skin changes occur with fever and a worsening general condition, seek prompt medical evaluation.Condition GuidancePityriasis RoseaPityriasis rosea typically begins with a large, oval 'herald patch' with scales on the edges appearing on the chest, abdomen, or back, followed by smaller oval patches spreading to the torso and limbs. On the back, these may be arranged like a Christmas tree along the skin folds. Depending on skin tone, they may appear pink, red, purple, gray, or brown, and itching may be absent or severe. If there are new rashes during pregnancy, painful blisters, mucosal skin changes, fever, difficulty breathing, or rapid worsening, you must seek prompt medical evaluation as other causes must be checked first.Differential Diagnosis GuideHives vs. Eczema: How many hours they stay is the primary distinctionWheals from hives usually do not stay in the same spot for long and tend to move, whereas eczema lesions persist for several days and may leave scaling, oozing, or cracking.Differential Diagnosis GuideHow to distinguish between psoriasis, hives, and eczema when the skin is red and itchy?Psoriasis often leaves plaques with distinct borders in the same location for a long time; hives usually fade within a day; and eczema may involve dryness, oozing, and cracking for several days.

Evidence and Update Information

The following materials were referenced for the differential diagnosis of similar skin diseases and the criteria for continuing existing treatments. The direction of Korean herbal medicine and acupuncture treatment is determined by examining these alongside skin patterns, sleep, and general systemic condition.

American Academy of Dermatology Urticaria GuideThe course of wheals and urgent accompanying symptoms were verified.
NIAMS Psoriasis GuideThe chronic course of psoriasis and accompanying symptoms requiring medical evaluation have been confirmed.