Differential Diagnosis of Perioral Rash

How to Distinguish Perioral Dermatitis, Rosacea, Acne, and Contact Dermatitis: A Guide to Differentiating Small Papules Around the Mouth

Name: Perioral dermatitis, rosacea, acne, and contact dermatitis: how to distinguish small papules around the mouth
Published: 2026-08-23

Instead of zooming in only on the area around the mouth, take a single photo that includes the sides of the nose, the eye area, and the lip boundary, and please list the range of cosmetics, toothpaste, andointmentPlease also write down the extent of the area affected.

Last modified August 23, 2026Doctor of Korean Medicine Yeon-seung Choi

Click on unfamiliar terms to see their meanings immediately.

Small red bumps around the mouth and sides of the nose papulesmay look like acne, but comedonesthe distribution, such as the absence of bumps or clear skin immediately adjacent to the lips, is a key clue. Please also note when you started using new cosmetics, toothpaste, or facial ointments.

Points to check in the photos first

Even if they look similar, the dead skin, blisters, and borders may differ

We have provided both typical appearances and examples that look slightly different. Do not decide based on a single similar photo; compare how long symptoms like dead skin, wheals, comedones, or oozing have persisted in the same area.

Educational close-up example of rosacea showing multiple red papules and small pustules without comedones over persistent erythema on the cheeks and beside the nose — **Papules and small pustules on a red base without comedones**
The papules and pustules of rosacea resemble acne, but the absence of comedones is a key clue. Actual differentiation is based on the distribution of lesions and their progress.

Educational close-up example of acne showing small closed comedones and open comedones centered on adult cheek skin — **Acne-like lesions centered on comedones**
Comedones are important clues for distinguishing acne from rosacea or seborrheic dermatitis. Do not just compare red pimples; check if clogged pores are also visible.

Educational close-up example of contact dermatitis showing a band-shaped redness and fine scales, as if a band touched the wrist — **Redness formed along the shape of contact on the wrist**
Even if the boundary is not perfectly straight, whether the rash overlaps with the area of contact, such as from a watch, band, or adhesive, serves as a clue. The date the product was changed is also verified.

Educational close-up example of facial skin showing visible fine blood vessels over persistent redness centered on the cheeks and sides of the nose, without comedones — **Fine superficial blood vessels visible over persistent erythema**
Redness in the center of the face and fine blood vessels that remain even when not triggered are different clues from temporary flushing. We check for rosacea along with papules, scaling, and eye symptoms.

Points to check	Perioral Dermatitis	Rosacea	Acne	Contact Dermatitis
Core Appearance	Small papules, dryness, flaking, burning sensation	Persistent erythema, visible blood vessels, papules without comedones	Inflammation of varying sizes compared to comedones	Redness, itching, and oozing in the area of contact
Distribution	Around the mouth, nose, and eyes; skin immediately next to the lips may be clear	Central cheeks and nose	Sebaceous areas such as the chin, cheeks, and forehead	May overlap with the boundaries of product application
Important Records	Facial steroids, cosmetics, toothpaste	Heat, alcohol, UV rays, eye symptoms	Menstruation, products, friction, comedones	Start date of new products, patch test
Caution	Do not abruptly change prescribed ointments on your own	Eye evaluation for eye pain or changes in vision	Risk of deep nodules or scarring	Check for severe swelling or mucosal symptoms

Look for a thin band and comedones immediately next to the lips

Perioral dermatitis may present as clusters of small papules around the mouth, sides of the nose, and around the eyes, while the area immediately adjacent to the lip border may appear relatively clear. If comedones are prominent, the possibility of acne is considered more likely.

Record the order of application for ointments and cosmetics

Note the start dates of steroid ointments used on the face, layered cosmetics, new toothpaste, and sunscreen, and keep these with photos of the lesions. Do not arbitrarily stop or change prescribed medications based on internet posts; determine the plan during a medical evaluation.

Distribution extending to the nose, cheeks, and around the eyes helps with differential diagnosis

Persistent erythema, visible blood vessels, and burning sensations in the center of the face are clues for rosacea, while itchy rashes along the contact borders suggest contact dermatitis. It is easy to miss the overall distribution when looking only at a magnified photo of one area.

Please take a photo that captures the lip border, sides of the nose, and around the eyes all at once

Please take a photo showing whether there is a band of remaining skin color immediately next to the lip border and if blackheads or whiteheads are visible. Also, please note when you started using new toothpaste, cosmetics, or ointments.

Observe the lip border, comedones, central facial erythema, the area where products were applied, and the order of ointment use together.

Next reading

Content to follow

Could facial redness, burning sensations, and small papules be rosacea?
How is it distinguished from acne, seborrheic dermatitis, and contact dermatitis?
Why is herbal medicine treatment important for recurring rosacea symptoms after using ointments?

Medical Evaluation GuideWhat should I record when symptoms improve after applying ointment but then reappear?Rather than simply noting that symptoms have reappeared, please record which area became itchy again and after how many days, the name and frequency of the ointment used, and any new changes such as oozing, pain, or a feeling of heat. It is important to consult with your prescribing medical provider before suddenly stopping or changing a prescribed ointment on your own.Medical Evaluation GuideWhen your skin changes after using new cosmetics, shampoo, or detergentsRather than attributing the cause to a single new cosmetic product, please record the affected areas, the date you started using it, whether the product was rinsed off or left on the skin, and any substances you come into contact with through your occupation or hobbies. Sensitive areas such as the eye area and face can also be affected indirectly through substances on your hands or in the air.

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

Skin terms used in this differential guide

TelangiectasiaTelangiectasia refers to a change where fine red lines are persistently visible on the cheeks, nose, etc. It may appear alongside temporary flushing, but it does not mean the same thing.PapuleA papule refers to a small, raised skin lesion. Unlike pustules containing pus or vesicles containing clear fluid, papules often feel firm beneath the surface.Skin heat sensationSkin heat sensation is the feeling that the skin is "burning or flushing." We distinguish between actual fever, inflammatory heat, flushing, and neurogenic sensations.Contact allergenContact allergens are substances, such as fragrances, metals, or preservatives, that can cause an allergic reaction when they touch the skin. This is not the same as an irritating substance.Patch testA patch test is an examination where various substances are applied to the back and skin reactions are monitored over several days. Its purpose differs from the skin prick test, which identifies immediate allergies.

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

Redness and papules on the face and scalp can recur not only due to external exposure and local inflammation, but also in conjunction with heat sensations, stress, and sleep patterns. Based on differential diagnosis and previous treatments, Korean herbal medicine treatment focusing on managing the conditions that cause recurrence may be central.

Before the consultation

We ask where it appeared and when it worsened again

We examine the duration of the flushing, the presence of capillaries, papules, pustules, and scales, as well as eye symptoms and reactions related to digestion, sleep, and tension.

During treatment

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

We check how long the redness lasts, the number of new papules, the burning sensation, and the burden felt during face-to-face activities.

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

Evidence and Update Information

This content was organized by Korean medicine doctor Choi Yeon-seung and updated on 2026-08-23.

American Academy of Dermatology, Perioral dermatitis
American Academy of Dermatology, Rosacea diagnosis and treatment
AAD, Rosacea signs and symptomsFlushing, persistent color change, blood vessels, papules, skin thickening, and eye symptoms