Related Experiment Video
Updated: May 20, 2026

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia
Published on: August 9, 2024
Nevus oligemicus: a case series
Background:
Nevus oligemicus is a functional nevus caused by vasoconstriction of the cutaneous deep vascular plexus, and vasodilatation of vessels of the superficial dermis due to abnormal responses of adrenergic receptors. To the best of our knowledge, only 14 cases in 8 articles were reported in the revised indexed literature. Case report We present five cases of nevus oligemicus in two males and in three female patients. Common characteristics in all patients were overweight and sedentary habits.
Discussion:
Nevus oligemicus is an uncommon condition characterized by livid and cyanotic patches with localized hypothermia as the key-diagnostic sign. It has been suggested that this entity is probably underdiagnosed, as it is asymptomatic and remains stable in its evolution.
Related Concept Videos
Skin Cancer
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Papillary Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
Changes in Skin Color: Clinical Perspectives
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
