Clinical photograph (dermatology) showing erythema marginatum, an annular, non-itchy rash characteristic of acute rheumatic fever. The image depicts multiple pink to red circular to oval patches on the skin of the lower extremity with sharply demarcated, serpiginous margins and centers that appear pale or clearing. Lesions are non-vesicular, smooth-surfaced, and vary in size, with a tendency to migrate or transiently flare. The distribution favors the trunk and proximal limbs and typically spares the face. On close inspection the patches lack scaling and crusting, consistent with erythema marginatum rather than dermatitis or fungal infection. This cutaneous manifestation is part of the Jones criteria and may correlate with concurrent migratory polyarthritis, fever, and evidence of preceding group A Streptococcus infection. Histologic features (if biopsied) would show superficial perivascular lymphocytic infiltrate and dermal edema with minimal epidermal changes; clinically, the rash is a marker for systemic inflammatory involvement. Differential considerations include urticaria, erythema multiforme, tinea corporis, pityriasis rosea, and other annular dermatoses. Clinically, recognizing erythema marginatum prompts evaluation for acute rheumatic fever and guides management including antibiotic therapy and anti-inflammatory treatment. The image serves educational and diagnostic-reference purposes for dermatology, pediatrics, infectious diseases, and rheumatology training.

Clinical photograph showing the dorsal surface of a human hand, specifically focusing on the interphalangeal joints. Two prominent subcutaneous nodules are visible over the joint space, indicated by black arrows. These nodules appear as firm, well-circumscribed, painless elevations under the skin. They are flesh-colored to slightly pale, with smooth overlying skin and no signs of acute inflammation, erythema, or ulceration. This finding is a characteristic major Jones criterion for the diagnosis of acute rheumatic fever. The image serves as an educational tool for identifying extra-articular manifestations of rheumatological and post-streptococcal conditions in a clinical setting.

This is a clinical dermatology photograph capturing erythema marginatum on the skin of the lower limb. The modality is Clinical photography; technique: naked-eye, color-balanced image. The observed lesions are erythematous, annular plaques with central clearing and pale, sometimes hypopigmented centers. Lesions appear as rings with slightly raised margins and a uniform pink-to red hue; they range from 0.5 to 2 cm in diameter and may coalesce into larger plaques. The rash is typically non-pruritic and evanescent, with temporary eruption that may migrate or fade over hours to days; distribution commonly involves the trunk and proximal limbs, with sparing of the face. The image may reflect erythema marginatum, a cutaneous manifestation associated with acute rheumatic fever and autoimmune inflammatory processes. In longer-standing presentations, the rash signals preceding or concurrent carditis and migratory arthritis; therefore clinical correlation with recent group A Streptococcus infection, elevated ASO titers, and echocardiography is essential. Differential diagnoses include urticaria, erythema multiforme, pityriasis rosea, and drug-induced eruptions. Clinically, this finding has diagnostic significance as a major criterion in rheumatic fever per Jones criteria; management focuses on antibiotic treatment of streptococcal infection and secondary prophylaxis. This image serves educational purposes for medical students, residents, and researchers studying connective tissue disease and pediatric rheumatology.

This clinical photograph displays a close-up view of the right upper extremity, specifically the extensor surface of the elbow region. The primary clinical finding is the presence of multiple, small subcutaneous nodules. These nodules appear as firm, rounded, non-tender-looking elevations beneath the skin surface, typically measuring less than 1 cm in diameter. The overlying skin is intact, displaying normal pigmentation and texture without visible erythema, warmth, or ulceration. Prominent hair follicles are visible as dark punctate spots across the skin. In a clinical context involving polyarthralgia and carditis, these nodules are a major Jones criterion for the diagnosis of acute rheumatic fever (ARF). This image serves as a teaching tool for medical students and clinicians to recognize the dermatological manifestations of systemic streptococcal-related diseases and rheumatological disorders.