Clinical photograph of the inguinal-pubic intertriginous region showing obesity-associated acanthosis nigricans with multiple pedunculated skin tags (acrochordons). The image depicts symmetric, hyperpigmented, velvety plaques along skin folds in the groin and inner thighs, with coexisting small, soft, finger-like papillomas along the lesional margins. Skin tone darkening ranges from brown to charcoal-gray, with slight surface gloss and diffuse textural thickening. The surrounding skin is relatively unremarkable aside from mild creasing. Imaging modality: dermatologic clinical photography; technique: close-up, high-resolution color image with diffuse, even illumination to enhance contrast between pigmented, velvety epidermis and normal skin. Anatomical location: intertriginous groin region, including pubic creases and proximal thigh folds; laterality: bilateral; plane: frontal view. Pathophysiology: insulin resistance-driven keratinocyte and epidermal proliferation leading to thickened, hyperpigmented plaques; secondary acrochordons arise in skin folds. Notable features: acanthosis nigricans associated with obesity, metabolic syndrome, and diabetes risk; skin tags reflect friable, pedunculated papillomas. Diagnostic significance: strong indicator of impaired glucose tolerance; warrants metabolic workup (fasting glucose, HbA1c), obesity management, and surveillance for diabetes. Differential considerations include malignant acanthosis nigricans (paraneoplastic) and drug-induced variants. Clinical correlation: correlate BMI, family history, and endocrinologic evaluation; reinforce lifestyle modification. Useful for dermatology education and clinical teaching resources. Appropriate documentation supports patient counseling and referral.

Clinical photograph of the posterior and lateral aspect of a patient's neck demonstrating classic features of acanthosis nigricans. The affected skin shows significant hyperpigmentation and symmetric, velvety thickening (lichenification) with prominent, exaggerated skin folds. The texture appears roughened and 'dirty' in appearance, with the most intense darkening occurring within the deeper cutaneous creases. The boundaries of the lesion are poorly defined, blending gradually into the surrounding normal skin. This dermatological manifestation is a key clinical marker often associated with systemic conditions such as insulin resistance, type 2 diabetes mellitus, and metabolic syndrome, or as part of specific genetic syndromes like Alström syndrome. The image serves as an educational example of metabolic-related skin changes and is essential for clinical recognition and diagnosis in endocrinology and dermatology.