Clinical photography of a cutaneous plaque consistent with lichen simplex chronicus (neurodermatitis) affecting the dorsal hand/forearm. The image demonstrates hyperkeratotic, lichenified plaques with pronounced thickening of the epidermis and accentuated linear skin creases. The plaques are pigmented with variably brown to slate-gray hyperpigmentation and a scaly, rough surface. Dermal inflammation is suggested by peripherally hyperemic borders and faint erythema within the lesion. The distribution appears localized with well-defined margins, and there may be minor fissuring at pressure points. The appearance reflects chronic itch-scratch cycle leading to chronic scratching, which perpetuates the lichenification. The photograph provides a high-resolution, close-up view suitable for dermatology education and differential diagnosis. Notable differentials include atopic dermatitis, discoid (plaque) psoriasis, chronic contact dermatitis, and seborrheic dermatitis; however, the thickened, hyperpigmented plaques with accentuated creases and absence of classic psoriasis scale or orange staining favors lichen simplex chronicus. Clinically, this lesion would correlate with pruritus, focal scratching, and relief after rubbing; management considerations include topical corticosteroids, occlusion, antihistamines, and behavioral modification. This image is relevant for digital dermatology repositories, medical education, and phenotype documentation of neurodermatitis. Documentation should note lesion size, exact location, patient-reported itch intensity, nocturnal scratching, and response to therapy for longitudinal tracking and education.

This is a high-resolution clinical photograph of a single, chronically irritated plaque on the forearm, captured with standard color dermatology photography under daylight illumination. The image depicts lichen simplex chronicus (neurodermatitis) manifesting as a well-demarcated, thickened, hyperpigmented plaque with prominent lichenification and fissuring at the surface. The lesion shows intensified skin markings, wrinkling, and a slightly violaceous hue around the periphery, reflecting chronic rubbing and scratching. The surrounding skin is mildly erythematous with subtle edema, consistent with ongoing pruritus and inflammatory response. From a dermatoscopic perspective, surface scales may be scant; however, tactile palpation would reveal firm, leathery consistency. Clinically, lichen simplex chronicus results from an itch-scratch cycle, producing epidermal hyperplasia (acanthosis), hyperkeratosis, and dermal papillary fibrosis. The image highlights typical features used to distinguish chronic eczematous dermatitis from acute flares, such as the thickened plaque, accentuated lines, and lack of acute exudation. Diagnostic significance lies in recognizing chronicity, guiding therapy with potent topical corticosteroids or calcineurin inhibitors, and addressing itch management, psychological triggers, and behavioral modification. Clinically relevant use cases include medical education, dermatology training, differential diagnosis exercises, and image-based documentation for patient records and tele-dermatology. This description supports accurate coding and reproducible educational content for teaching and research in dermatology training.

This clinical photograph consists of two panels (A and B) showing a biopsy-confirmed case of lichen simplex chronicus on the left dorsal hand of an elderly patient. Panel A provides a distant view, situating the lesion proximal to the second metacarpophalangeal joint. Panel B offers a close-up (macro) view for detailed morphological assessment. The lesion is a solitary, erythematous, circumscribed plaque approximately 14 x 10 mm in size, highlighted by a black oval. Key clinical features include prominent lichenification (thickening of the skin with exaggerated skin lines), surface scaling (whitish, fine scales), and ill-defined to moderately well-defined borders. The surrounding skin exhibits signs of chronological aging and actinic damage, including solar lentigines and fine rhytids. This image serves as an educational example of the classic presentation of a chronic eczematous process resulting from repeated scratching or rubbing, demonstrating the characteristic texture and color changes associated with lichen simplex chronicus in a common anatomical location.

Clinical photograph of lichen simplex chronicus (neurodermatitis) on the upper arm, displaying red-brown, thickened plaques with conspicuous lichenification and accentuated skin markings. The lesion shows a rough, hyperkeratotic surface with underlying erythema, mild scaling, and scratching-induced excoriations. Chronic rubbing perpetuates the itch-scratch cycle, resulting in epidermal hyperplasia (acanthosis) and dermal inflammation, which may produce pigmentary alteration over time. Distribution is localized to a discrete upper-arm region, a common site for neurodermatitis due to habitual rubbing. The boundary is often ill-defined with variable borders, and the surrounding skin may be moderately dry. The image emphasizes hallmark features: durable plaque formation, pronounced skin folding, and a pattern consistent with localized chronic dermatitis rather than an acute eruption. Clinically, this appearance guides diagnosis toward lichen simplex chronicus and helps differentiate from psoriasis, tinea, or acute contact dermatitis. Management implications include potent topical corticosteroids, calcineurin inhibitors in sensitive areas, regular emollients, antihistamines for itch, and behavioral strategies to break the scratching cycle. The photo is valuable for dermatology education, teledermatology triage, and visual recognition of chronic itch-scratch dermatoses on the upper limb. This imaging scenario also supports patient education on chronic dermatitis, triggers identification, and adherence to treatment regimens.

Clinical photograph of a single discoid eczema (nummular dermatitis) plaque on skin of color. Modality: Dermatology photography; technique: close-up, macroscopic view, non-dermoscopic; the lesion is coin-shaped (round to oval), well-demarcated, approximately 1.5–2 cm in diameter. Central area shows diffuse scaling with a crusted surface of grayish-brown hue, surrounded by an erythematous, slightly edematous border. The surrounding skin demonstrates post-inflammatory hyperpigmentation typical of darker phototypes. Textural change includes thickened, xerotic skin with mild fissuring at the periphery. No adjacent vesicles or pustules are evident. Lighting shows warm undertones; surface reveals adherent scale and crust, reflecting chronic inflammation. The differential diagnosis includes tinea corporis, plaque psoriasis, contact dermatitis, and chronic eczema variants; clinical correlation with pruritus, chronicity, and relapsing-remitting pattern favors discoid eczema. In skin of color, hyperpigmentation can persist after inflammation, which may complicate assessment of lesion boundaries. This image is valuable for education on morphology of coin-shaped eczematous plaques and for distinguishing discoid eczema from fungal infections in pigment-rich skin. Potential clinical use cases include dermatology training, telemedicine skin lesion assessment, comparative studies of pigmentary responses, and monitoring response to topical corticosteroids and emollients. This single-field photograph supports recognition of characteristic features: well-marginated plaque, central scaling/crusting, erythematous halo, and pigmentary change.

Clinical photography of skin, frontal anterolateral view of the forearm showing discoid eczema (nummular dermatitis) on darker skin. The plaques are coin-shaped, 1–3 cm in diameter, with well-demarcated, slightly scaly borders and a dry, dull sheen. Central areas show relative pallor or lighter pigment, while the outer margins exhibit erythema and hyperpigmentation consistent with postinflammatory changes common in skin of color. Surface scales are adherent, with fissuring at the edges in some plaques; minor excoriations reflect pruritus. The surrounding skin appears dry with reduced textural smoothness, characteristic of xerosis. No overt vesicles or purulent discharge are visible. The distribution is focal to the extensor aspect of the forearm, contrasting with flexural eczema patterns, and may be bilateral but is photographed unilaterally here. The appearance aligns with discoid eczema or chronic nummular dermatitis, often seen in adults with dry or compromised barrier function and irritant exposure. Secondary infection is not evident clinically. Clinically, these findings warrant management focusing on potent topical corticosteroids or calcineurin inhibitors as appropriate, stringent emollients, avoidance of irritants, and follow-up to monitor response and possible recurrence. The image provides a clear visual reference for recognition of color-variant plaque morphology and the chronicity of lesions in dermatologic practice, education, and dermatoepidemiology research.

This image is a high-resolution clinical photograph of the left ankle region showing discoid eczema (nummular dermatitis). The skin exhibits multiple coin-shaped erythematous plaques, approximately 0.5–2 cm in diameter, with dry scaling, peripheral crusting, and mild surface excoriation from pruritus. Lesions are well-demarcated and arranged singly and in small clusters along the lateral malleolar area and distal lower leg. Perilesional erythema and xerosis are evident; surrounding skin appears dry without overt infection. The pattern is localized to the ankle region, a common site for discoid eczema, though plaques may appear on dorsum of hands or extensor surfaces in other contexts. Differential considerations include tinea corporis, contact dermatitis, psoriasis, and seborrheic dermatitis. Clinically, discoid eczema is associated with atopy and chronic itch, and management focuses on skin hydration, regular emollients, and anti-inflammatory therapy (topical corticosteroids and calcineurin inhibitors) with avoidance of irritants. This image serves as an educational reference for annular plaque dermatoses, differential diagnosis, and treatment response assessment in chronic eczematous skin disease.

Clinical photography of multiple annular, erythematous plaques on the trunk. The lesions show well-demarcated circular borders with superficial scaling and central clearing, consistent with tinea corporis until proven otherwise. The morphological pattern is ring-shaped (annular) with a slightly raised, erythematous margin and dry scale at the edge. Colors range from pink to brick-red, with varying intensity due to lighting. The trunk is the primary region; symmetrical or scattered lesions may occur, often pruritic. The image illustrates characteristic dermatophyte infection of the cutaneous surface, invading stratum corneum with hyphal elements; differential includes granuloma annulare, nummular eczema, pityriasis rosea, pityriasis circinata, and less likely psoriasis. Clinically significant because early recognition allows topical antifungal therapy (terbinafine, itraconazole) or systemic treatment for extensive disease, and avoids unnecessary biopsy. Suggested confirmatory tests include KOH preparation showing hyaline fungal elements or fungal culture. This photo is suitable for medical education, dermatology training, and dermatopathology correlation; it supports telemedicine triage and patient counseling. Annotated features include annular lesion morphology, active border, central clearing, peripheral scale, and trunk localization. Visual cues such as peripheral scale and erythematous edge aid rapid presumptive diagnosis, while correlation with symptoms (itching) and exposure history supports management decisions and prognosis for educational purposes.

A high-resolution clinical photograph in frontal view of the abdomen and anterior trunk shows widespread, annular, erythematous, scaly plaques with well-defined, active borders and central clearing, classic for tinea corporis (dermatophytosis). The lesions vary in size and appear to coalesce across the midline and lateral abdominal surfaces, with peripheral scaling and mild erythema. Some plaques display lighter centers and darker pruritic borders, and a few areas show subtle vesiculation at advancing margins. No mucosal involvement is evident. The image demonstrates ring-shaped morphology, multiple lesions, and a diffuse trunk distribution that is educational for recognizing extensive cutaneous fungal infection. This depiction supports differential diagnoses including nummular dermatitis, eczema, psoriasis, pityriasis rosea, and granuloma annulare, though the characteristic central clearing and annular configuration strongly favor dermatophyte infection. Clinically, the finding informs management with topical antifungals (azoles or allylamines) and, in extensive disease, systemic therapy such as terbinafine or itraconazole, along with precautions to prevent transmission. The photograph serves as a valuable teaching resource for dermatology, infectious disease, and medical education, illustrating clinical presentation, morphological features, and the importance of correlating with mycological testing when needed. Imaging modality: clinical photography; technique: digital capture; no contrast.

Clinical photograph of a cutaneous lesion illustrating a well‑circumscribed annular plaque with central clearing. The image shows a pink‑red, slightly raised border with fine desquamation against a moderately pigmented skin background. The central area is less inflamed and relatively pale, giving the classic ring‑like (annular) appearance. The lesion is non‑uniform in texture, with mild surface scaling along the active border. Such features are highly suggestive of superficial dermatophyte infection, most consistent with tinea corporis (ringworm) involving the trunk or proximal limbs. Differential considerations include granuloma annulare, nummular dermatitis, and less likely psoriasis with annular morphology. The color and margin support fungal etiology, but confirmation requires mycological testing (potassium hydroxide preparation, fungal culture) or dermoscopy in some settings. Clinically relevant findings include pruritus and possible exposure to infected individuals or animals; lesions typically respond to topical antifungals (terbinafine, itraconazole if extensive) and environmental hygiene measures. This image is suitable for dermatology education, medical student dermatology training, and research on cutaneous fungal infections, differential diagnosis instruction, and exam prep. The content emphasizes macroscopic morphology, border architecture, and central clearing as critical diagnostic cues. This description complements pathology reports by correlating clinical appearance with expected histologic features if biopsy were performed later.