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Related Concept Videos

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...
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...
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...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
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...
Cells of the Epidermis01:24

Cells of the Epidermis

The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...

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Related Experiment Video

Updated: May 20, 2026

A 3D Organotypic Melanoma Spheroid Skin Model
08:49

A 3D Organotypic Melanoma Spheroid Skin Model

Published on: May 18, 2018

[Dermatofibroma or melanoma?].

A Blum1, R Hofmann-Wellenhof

  • 1a.blum@derma.de

Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete
|July 4, 2012
PubMed
Summary
This summary is machine-generated.

Dermatoscopy revealed dermatofibroma-like features in three patients. The unique pattern, featuring peripheral hyperpigmentation and central hypopigmentation, necessitates considering melanoma in the differential diagnosis.

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A Mouse Model to Investigate the Role of Cancer-Associated Fibroblasts in Tumor Growth
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Last Updated: May 20, 2026

A 3D Organotypic Melanoma Spheroid Skin Model
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Combining Reflectance Confocal Microscopy with Optical Coherence Tomography for Noninvasive Diagnosis of Skin Cancers via Image Acquisition
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A Mouse Model to Investigate the Role of Cancer-Associated Fibroblasts in Tumor Growth
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A Mouse Model to Investigate the Role of Cancer-Associated Fibroblasts in Tumor Growth

Published on: December 22, 2020

Area of Science:

  • Dermatology
  • Dermoscopy
  • Oncology

Background:

  • Dermatofibromas are common benign skin tumors.
  • Dermoscopy is a non-invasive imaging technique crucial for skin lesion evaluation.
  • Accurate diagnosis of skin lesions is vital to exclude malignancy.

Observation:

  • Three patients presented with multiple, side-by-side skin lesions on their back.
  • Dermoscopic examination showed features resembling dermatofibromas in these lesions.
  • A distinct pattern of peripheral postinflammatory hyperpigmentation surrounding central scar-like hypopigmentation was noted.

Findings:

  • The observed dermoscopic pattern mimicked multiple dermatofibromas.
  • The presence of specific features, namely peripheral hyperpigmentation and central hypopigmentation, is highlighted.
  • This unique presentation requires careful consideration in the diagnostic process.

Implications:

  • The findings underscore the importance of considering melanoma in the differential diagnosis of lesions with these specific dermoscopic features.
  • This case series emphasizes the need for thorough evaluation of atypical presentations.
  • Improved diagnostic accuracy for challenging skin lesions can be achieved through detailed dermoscopic analysis.