Clinical photography of the skin in an adult male demonstrating pityriasis rosea with a herald patch on the left shoulder and a secondary eruption across the anterior trunk. Modality: Clinical color photograph of cutaneous lesions. Anatomical location: trunk and left shoulder; body region: anterior chest, shoulders; left shoulder herald patch. Visual features: a focal, oval, erythematous patch with a fine, peripheral, collarette scale characteristic of a herald patch, measuring several centimeters in diameter; surrounding smaller, discrete, pink-to-reddish papules and plaques arranged along the trunk in a roughly perpendicular or 'Christmas tree' distribution. The skin surface shows mild surface scaling, slight erythema, and no purulence or crusting. The overall appearance is consistent with pityriasis rosea in the classic stage, with the herald patch preceding or accompanying generalized lesions. Diagnostic significance: This pattern supports a self-limited, benign inflammatory dermatosis with uncertain etiology, possibly viral (HHV-6/7) association; prognosis is favorable, treatment typically supportive (emollients, anti-pruritics). Differential diagnoses include tinea corporis, pityriasis versicolor, secondary syphilis, and eczema. Clinical correlation is important: young adults, acute onset, trunk-dominant rash, PR often resolves in 6-8 weeks. This image is useful for education, pattern recognition, and dermatology teaching materials regarding herald patch and classic pityriasis rosea presentation criteria.

This is a clinical dermatology photograph of in vivo human skin on the forearm, illustrating a herald patch with accompanying pityriasis rosea–type lesions in a patient with skin of color. Imaging modality: clinical photography; technique: standard digital single-shot close-up under diffuse studio lighting or natural daylight. Primary subject: an oval to circular erythematous-to-pink patch with fine peripheral scaling (collarette scale) and slight central clearing, consistent with a herald patch of pityriasis rosea. Surrounding skin shows multiple smaller patches or papules at various stages of eruption, creating a subtle, tree-like distribution that may become more pronounced with trunk involvement in subsequent weeks. In darker phototypes, erythema can be muted, and residual postinflammatory hyperpigmentation may dominate as brown-pigmented patches after resolution. The lesion margins are well defined, the surface may show delicate scale, and there is no vesiculation or crusting observed. The image highlights characteristic pigmentary presentation in skin of color and emphasizes diagnostic cues: herald patch with collarette scaling, annular geometry, and the expected eruption sequence preceding a generalized rash. Clinically, this supports pityriasis rosea over mimics such as tinea corporis, eczema, or psoriasis, and informs patient counseling, prognosis, and follow-up assessment.

Imaging modality: Clinical photography of the anterior chest using standard color digital photography. Perspective: frontal view of the chest and upper trunk. Anatomical location: anterior thorax/pectoral region of the trunk, bilateral chest wall. Skin layer: epidermis and dermis involved with superficial scaling. Visual features: numerous erythematous to pink-brown oval and round macules and plaques distributed across the chest, some coalescing into larger patches; fine, peripheral scale is visible at lesion margins; lesions have slightly raised but flat morphology with a matte surface; no vesicles or crusts noted; mild surrounding erythema; skin texture appears normal elsewhere. Distribution: trunk-dominant eruption with symmetrical involvement of the chest, consistent with pityriasis rosea; clinical pattern may reflect a herald patch history in some individuals. Pathology: histology not available in this image; clinical likelihood favored by characteristic trunk involvement and collarette scaling. Diagnostic significance: supports diagnosis of pityriasis rosea when integrated with patient history and exam; helps distinguish from differential diagnoses such as tinea versicolor, eczema, seborrheic dermatitis, psoriasis, and secondary syphilis. Clinical relevance: useful for dermatology education, telemedicine documentation, and monitoring treatment response to topical steroids, calcineurin inhibitors, or antihistamines for pruritus. Suggested coding terms: pityriasis rosea, trunk eruption, chest rash, collarette scaling, herald patch (if present).

A clinical photograph series illustrating dermatological manifestations of secondary syphilis across three anatomical regions. Panel A shows the posterior trunk displaying a diffuse, symmetric, erythematous maculopapular rash. Panel B and C depict the bilateral palms and soles, respectively, featuring characteristic well-demarcated, rounded, erythematous to reddish-brown macules and papules. Some acral lesions exhibit subtle peripheral scaling, consistent with Biett's collarette. This classic 'copper-colored' rash distribution, specifically involving the palms and soles, is a pathognomonic clinical sign for secondary syphilis. The presentation highlights the generalized nature of the Treponema pallidum infection during the disseminated stage. This visual resource is intended for medical education regarding sexually transmitted infections and differential diagnosis of palmoplantar eruptions.

Clinical photograph of the palmar surfaces of both hands, demonstrating a bilateral, symmetric maculopapular eruption. The lesions are well-demarcated, varying in color from erythematous to dusky reddish-purple. The morphology consists of multiple round-to-oval macules and slightly raised papules, approximately 5-10 mm in diameter, distributed across the palms and extending onto the ventral surfaces of the fingers. Some lesions appear deeper in color with a copper-colored or ham-colored hue, characteristic of secondary syphilis. The surrounding skin is largely unremarkable, without significant edema or diffuse desquamation. In the clinical context of a genital chancre and high RPR titers, these findings are highly suggestive of the palmoplantar rash associated with secondary syphilis (syphilis stage II). This image serves as a classic diagnostic example of infectious dermatology for medical education, emphasizing the importance of examining the palms and soles in suspected systemic infections.

Six clinical photographs (labeled A-F) demonstrate a disseminated maculopapular exanthem and isolated pustules on a patient with dark skin. Images A, B, and C focus on the feet, showing scattered erythematous papules and distinct small, dark-colored pustules on the plantar surface and toes. Image D shows a diffuse erythematous maculopapular rash on the lower leg with interspersed small pustules. Image E displays sparse, individual papules across the back, and image F highlights a solitary papule on the dorsal aspect of a finger near the nail. The lesions are non-grouped and vary from small, raised red bumps (papules) to darker, fluid-filled elevations (pustules). The distribution is widespread, involving the palms, soles, extremities, and trunk. This clinical presentation is characteristic of systemic infectious processes, such as secondary syphilis or viral exanthems (e.g., mpox), and is useful for teaching dermatologic manifestations of systemic disease in diverse skin phototypes.