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Related Concept Videos

Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Papillary Dermis01:11

Papillary Dermis

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 Perspectives01:14

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Reticular Dermis01:15

Reticular Dermis

The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

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Related Experiment Video

Updated: Jul 4, 2026

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation
04:43

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation

Published on: May 23, 2025

Hypopigmented Reed nevus.

Celia Requena1, Luis Requena, Evaristo Sánchez-Yus

  • 1Department of Dermatology, Instituto Valenciano de Oncología, Valencia, Spain. celiareq@hotmail.com

Journal of Cutaneous Pathology
|June 13, 2008
PubMed
Summary
This summary is machine-generated.

Hypopigmented Reed nevus, a variant of Spitz nevus, presents without abundant melanin. This report details five cases, discussing clinical and histopathological features of this under-described melanocytic nevus.

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Area of Science:

  • Dermatopathology
  • Oncology

Background:

  • Reed nevus, or pigmented spindle cell nevus, is recognized as a variant of Spitz nevus.
  • It features spindle-shaped melanocytes in nests within the epidermis and papillary dermis, often heavily pigmented.

Observation:

  • Hypopigmented Reed nevus shares features with pigmented variants but lacks significant melanin.
  • This study presents five cases of hypopigmented Reed nevus, a condition sparsely documented in existing literature.

Findings:

  • Histopathological analysis confirms the characteristic spindle-shaped melanocytes and nesting patterns.
  • Melanophages may be present, but the defining feature is the reduced melanin content.

Implications:

  • Understanding hypopigmented Reed nevus is crucial for accurate dermatopathological diagnosis.
  • Further research is needed to fully elucidate the clinical behavior and significance of this variant.