Dermatological examination of the skin: methods

The goal of skin examination is to recognize dangerous conditions early, correctly classify the morphology of rashes, and select a minimally invasive approach to verifying the diagnosis. In 2023-2025, clinical guidelines will emphasize a complete examination of the entire skin, including the scalp, folds, nails, and mucous membranes, with mandatory recording of findings in a standardized format. This approach increases the detection of precancerous and early malignant lesions and reduces the number of missed cases. [1]

Key quality criteria include neutral lighting, a warm room, privacy, informed consent for examination and medical photography, the presence of an assistant if necessary, and respect for skin color differences. Current guidelines emphasize that rash phenotypes on darker skin phototypes appear different, and erythema may appear grayish-purple, so the description should take into account the skin phototype and coloration. [2]

European and international societies support the standardization of examination terminology, as well as a step-by-step diagnostic process: from clinical morphology and localization to non-invasive spot tests at the bedside, then to dermatoscopy and laboratory or histological confirmation only when indicated. This cascade reduces invasiveness and saves resources without sacrificing accuracy. [3]

Teledermatology and digital photography complement in-person examinations, but do not replace them. Standards for service, safety, image quality, and consent procedures for imaging were published in 2023-2024. They recommend standardized angles, scales, avoidance of filters, and a clear data retention policy. [4]

How to describe skin findings: template and rules

The basic notation includes five groups of features: primary element, secondary changes, color and surface, shape and edges, and body distribution with symmetry and configuration. This template improves the reproducibility of descriptions and facilitates communication between specialists. [5]

It is recommended to indicate dimensions in millimeters or centimeters, assess palpable density and temperature, check for pain and itching, and, if necessary, record the dynamics with standardized photographs. This is important for tracking the evolution of elements and response to therapy. [6]

When describing the skin, it is useful to document its general appearance: xerosis, ichthyosiformity, telangiectasias, and photodamage. These features help identify chronic dermatoses, photocarcinogenesis, and systemic associations. [7]

For initial assessments, primary care physicians are advised to use prepared checklists and checklists that systematize the steps of the full-body examination and the order of description. This reduces the omission of hard-to-reach areas and improves the completeness of documentation. [8]

Table 1. Structured template for reporting skin findings.

Block	What to record
Primary element	Macula, papule, plaque, nodule, vesicle, pustule, bulla, blister
Secondary changes	Scaling, crusting, erosion, ulceration, cracks, lichenification, atrophy, scar
Color and surface	Shade, uniformity, shine, peeling, crusting, ulceration
Shape and edges	Circular, annular, polycyclic, clear or blurred boundaries
Distribution	Localization, symmetry, photodistribution, dermatomal or linear pattern

Primary elements: definitions, examples, diagnostic value

Primary lesions are the initial manifestation of the process, appearing on unchanged skin. A macule is a flat discoloration. A papule and plaque are raised, dense lesions that vary in size. A vesicle and bulla are small vesicles and bullae that vary in diameter. A pustule contains purulent exudate. A nodule is located deeper and may indicate neoplastic or granulomatous processes. [9]

Asymmetry, irregular edges, multiple colors, diameter, and dynamics are important for suspecting melanoma. Dermoscopy enhances the accuracy of visual assessment but does not replace clinical description. Reviews from 2023–2024 showed that malignant lesions have a more "disorganized" pattern and at least one specific feature. [10]

Blister elements require clarification of the lesion level and risk factors. A clinical description of the cap height, tension, and distribution will help guide laboratory verification. Standardized descriptions reduce the need for biopsies due to accurate preliminary phenotyping. [11]

In erythematous spots and plaques, signs of photodamage, keratoses, and chronic inflammation are recorded. This is important for screening for precancerous conditions and planning surveillance. A complete examination helps identify multiple lesions that otherwise go undetected. [12]

Table 2. Primary elements and clinical associations

Element	Key Features	Possible first-line diagnoses
Macula	Flat color change	Melasma, vitiligo, drug-induced exanthema
Papule, plaque	Elevation, infiltration	Psoriasis, eczema, lichen
Vesicle, bulla	Cavity with liquid	Herpesvirus dermatoses, vesicular dermatoses
Pustule	Cavity with pus	Impetigo, folliculitis, acne
Knot	Deep infiltrate	Granulomas, skin tumors

Secondary elements and the evolution of foci

Secondary elements reflect the progression of the process or trauma: scaling, crusting, erosion, ulceration, cracking, lichenification, atrophy, and scarring. Their precise description allows us to distinguish inflammatory activity from the effects of scratching and pressure. [13]

Severe scaling and cracking against a background of xerosis are characteristic of chronic dermatoses and require an assessment of barrier function and skin care. Crusting and erosions are often secondary to itching and impetigo. These factors influence the choice of topical therapy and antibacterial strategy. [14]

Lichenification indicates chronic itching and scratching, requiring an assessment of triggers and comorbid psychodermatological burden. Atrophy and scarring record past activity and help plan cicatricial correction. [15]

In ulcerative defects, it is important to describe the edges, bottom, undermining, presence of subepidermal pockets, perifocal inflammation, since this determines the differentiation between inflammatory, vascular and tumor processes. [16]

Table 3. Secondary elements and practical solutions

Secondary element	What to check	First decision
Crusts, erosions	Impetiginization, herpetization	Sowing or PCR as indicated, barrier care
Lichenification	Chronic itching, triggers	Anti-itch strategies, scratch treatment
Cracks	Localization on the palms and feet	Keratolytics, occlusion, infection prevention
Atrophy, scars	Outcome of previous dermatoses	Scar correction, photoprotection
Ulcer	Edges, bottom, undermining	Differential series and biopsy along the edge

Distribution and Drawing: Clues for Differential Series

Configuration and distribution often lead to diagnosis more quickly than single morphology. Photoexposed areas suggest photodermatoses and actinic changes. Symmetry suggests systemic dermatosis, dermatomal pattern suggests herpes zoster, and linear configuration suggests the Koebner phenomenon or contact exposure scar. [17]

Acral localization and specific patterns on the palmoplantar skin require increased oncological attention, as clinical markers there are less expressive. In these areas, a low threshold for dermatoscopy and biopsy is justified. [18]

The presence of multiple keratoses associated with photoaging increases the risk of squamous cell skin cancer and dictates active surveillance and treatment of precancerous lesions. A full body examination allows for the detection of clinically silent lesions. [19]

For pruritus, the distribution pattern, nighttime aggravation, and the involvement of family or group contacts are important. These findings can immediately lead to a parasitic etiology. [20]

Table 4. Drawing and probable diagnoses

Drawing	The most probable reasons
Photo-exposed areas	Photodermatoses, actinic keratoses
Dermatomal	Herpes zoster
Linear	Koebner phenomenon, contact dermatitis
Acral	Special forms of melanoma, eczema, keratoderma
Symmetrical generalized	Psoriasis, atopic dermatitis, drug reactions

Bedside instruments: diascopy, Wood's lamp, dermatoscopy

Diascopy is a simple, non-invasive procedure involving pressing a transparent plate against the lesion. Blanching indicates a vascular component, while lack of blanching indicates hemorrhage or pigmentation. This method helps differentiate inflammatory erythema from purpura and clarify the nature of vascular lesions. [21]

A Wood's lamp enhances contrast in superficial infections, pigment disorders, and some metabolic conditions. Recent reviews describe characteristic fluorescence in porokeratosis, infections, vitiligo, and subclinical lesions of some dermatoses. Sensitivity depends on the darkening technique and skin preparation. [22]

Dermoscopy improves tumor recognition accuracy and reduces unnecessary biopsies. Recent reviews emphasize the importance of learning and mastering patterns for different anatomical areas. The combination of structure, color, and architecture is more important than a single feature. [23]

For pruritic generalized rashes, dermatoscopy helps visualize typical signs of scabies, including the "delta sign" and burrows. Scabies management guidelines rely on the consortium criteria and note the role of dermatoscopy and scraping microscopy for confirmation. [24]

Table 5. Quick Tools: When and Why

Tool	What does it answer?	When to apply
Diascopy	Blanching or not	Erythema versus purpura, vascular lesions
Wood's lamp	Fluorescence, contrast	Infections, pigment disorders, subclinical lesions
Dermatoscopy	Structures and colors	Oncoalertness, acral zones, controversial cases
Ink test for strokes	Visualization of moves	Suspicion of scabies
Ruler and scales	Size, dynamics	Observation and photo documentation

Hair and nails: what you shouldn't skip

Trichoscopy is a noninvasive technique for differentiating alopecia. Studies conducted in 2023–2024 demonstrated typical findings in androgenetic alopecia and alopecia areata and proposed semiquantitative severity indices. Recording these features is important before invasive procedures. [25]

Nail examination reveals pite, onycholysis, koilonychia, subungual hemorrhages, signs of clubbing, and changes associated with systemic diseases. Certain signs help identify psoriasis, iron deficiency, and vasculopathy. Current reviews and guidelines emphasize the importance of frontal and distal views. [26]

Nailfold capillaroscopy is useful in Raynaud's phenomenon and systemic sclerosis. Updated European guidelines offer standard templates and rapid algorithms for distinguishing disease patterns, although interobserver variability remains. [27 ]

Any painful or deforming changes in the nails, especially with pigmentation, require a low threshold for dermatoscopy and biopsy when indicated, since some tumors are disguised as chronic injuries and infections. [28]

Table 6. Nail signs and possible associations

Sign	Possible causes
Pete	Psoriasis, alopecia areata
Koyilonychia	Iron deficiency, trauma, endocrine disorders
Onycholysis	Psoriasis, mycosis, contact factors
Hemorrhages under the nails	Trauma, vasculopathy
Clubbing	Pulmonary and cardiac diseases, hypoxemia

When laboratory, dermatopathology and patch testing are needed

Skin biopsy is indicated for morphological verification of tumors and complex dermatoses. An excisional technique is preferred for suspected melanoma with adequate depth, as the Breslow thickness determines the stage. Punch biopsy is useful for inflammatory dermatoses, and a scarifying biopsy is useful for superficial lesions. Recommendations emphasize the criticality of site and depth selection. [29]

After the biopsy, local care and monitoring of healing are mandatory. Patients are advised of the timeframe for epithelialization and the specifics for the lower extremities, where healing is slower. A high-quality reminder reduces complications and follow-up visits. [30]

Patch testing is the gold standard for diagnosing allergic contact dermatitis. European guidelines recommend a core series of allergens, precise testing and reading techniques, and caution in special groups. Updates on patient substance selection and rare sensitizers will be published in 2024-2025. [31]

Oncologic vigilance for keratoses and suspicious plaques requires referral to oncology consultations. The 2023 European consensus on squamous cell skin cancer systematizes diagnosis, risk assessment, and prevention, which are important to consider already at the initial examination stage. [32]

Table 7. Selection of biopsy for typical tasks

Clinical task	Preferred technique
Suspicion of small melanoma	Complete excision with a narrow margin
Suspected non-melanoma malignancy	A punch of sufficient depth along the edge of the hearth
Unexplained inflammatory dermatosis	Punch from the active edge, a separate fragment for immunopathology
Blistering dermatoses	Punch with inclusion of the area of intact skin next to the blister
Subungual lesions	Biopsy taking into account the anatomy of the matrix and bed, dermatoscopic control

Digital Photography and Teledermatology: How to Increase the Value of Your Images

Photo quality directly impacts diagnostic value and patient management. Professional standards recommend a neutral background, consistent angles, scale, the absence of makeup and glare, and mandatory informed consent for the photography and use of images. [33]

In teledermatology, clear images of overview and detailed plans, adherence to confidentiality rules, and a documented triage process remain crucial. A consensus review indicates the need for local protocols and staff training. [34]

Standardized checklists and reference scales are used for research and monitoring dynamics, which improves image comparability between visits and centers. This is especially important for chronic dermatoses and in cosmetic dermatology. [35]

Patients should be educated about the limitations of remote assessment and the signs that warrant in-person examination with dermatoscopy or biopsy. This reduces delays in the diagnosis of malignant neoplasms. [36]

Table 8. Clinical Photo Quality Checklist

Paragraph	Performance Criteria
Lighting	Uniform, without glare
Angles	General, medium, large, repeatable
Scale	A ruler or scale in the frame
Clean skin	Without makeup and artifacts
Documentation	Consent for filming and storage

Practical Algorithm: From Symptom to Action

If the complaint is about a "new spot": conduct a full examination, describe the pattern, perform a dermatoscopy, and assess risk factors. If there are suspicious signs, perform an excisional biopsy for accurate staging. [37]

If generalized pruritus is present, assess the distribution and nighttime aggravation, inspect the contacts, perform a dermatoscopy for burrows, and, if necessary, microscopic examination of scrapings. Treatment and anti-epidemic measures are prescribed after confirmation. [38]

If bullous elements: describe the level of the lesion and location, take a biopsy from the area near the blister for histology and immunopathology, assess drug risk factors. [39]

If a chronic plaque rash is present: describe the morphology and location, evaluate the nails and scalp, and document with photographs. If in doubt, perform dermatoscopy and targeted biopsy. [40]

Table 9. Quick solutions for common clinical scenarios

Scenario	First steps	Further according to the indications
New pigmented plaque	Full examination, dermatoscopy	Excisional biopsy
Itchy generalized rash	Map of lesions, dermatoscopy of passages	Microscopy, treatment and contact tracking
Plaques on the extensors	Dermoscopy, nail examination	Therapy, biopsy if in doubt
Chronic ulcers	Description of edges, bottom, infection	Marginal biopsy, vascular assessment
Atypical acral lesions	Dermoscopy, low threshold biopsy	Onco-routing

Minimum set for a doctor's appointment

The office equipment should include a transparent diascopy plate, a Wood's lamp, a dermatoscope, a ruler and scales, sterile punch biopsy kits, a standardized set of consent documents for photographs, and a teledermatology routing protocol. This equipment ensures the implementation of a modern examination standard without delays. [41]

Dermoscopy training measurably improves diagnostic accuracy and the ratio of benign to malignant biopsies. Programs for primary care physicians demonstrate consistent benefits and should be implemented at the facility level. [42]

Given the diversity of phototypes, staff must be able to recognize atypical visualizations of erythema and inflammation, adjust lighting, and switch to color-independent methods, including dermatoscopy and diascopy, if necessary.[43]

Table 10. Minimum set of tools and documents

Component	Purpose
Transparent plate	Diascopy for erythema and purpura
Wood's lamp	Contrast in infections and pigment disorders
Dermatoscope	Oncoscreening, controversial elements, acral zones
Punch biopsy kit	Morphological verification
Scales and ruler	Measurements and dynamics
Consent forms for photography and telemedicine	Legal and ethical correctness