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Skin Cancer01:30

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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.
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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.
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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.
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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.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Mar 30, 2026

Quantification of Hypopigmentation Activity In Vitro
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[Differential diagnostics of hypomelanoses].

M Böhm1

  • 1Klinik für Hautkrankheiten, Universitätsklinikum Münster, Von-Esmarch-Str. 58, 48149, Münster, Deutschland. bohmm@uni-muenster.de.

Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete
|November 5, 2015
PubMed
Summary

Hypomelanoses are skin pigment disorders with diverse causes, including genetic defects and autoimmune issues. Recent advances offer new treatment strategies for common conditions like vitiligo.

Keywords:
AlbinismsMelaninMelanoblastMelanogenesisVitiligo

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Area of Science:

  • Dermatology
  • Genetics
  • Immunology

Context:

  • Hypomelanoses encompass diverse congenital and acquired skin pigment alterations.
  • Pathobiology involves melanoblast migration defects, melanogenesis issues, and pigment cell destruction.
  • Universal forms may indicate internal organ involvement, necessitating interdisciplinary care.

Purpose:

  • To review the heterogeneous pathobiology of cutaneous hypomelanoses.
  • To highlight recent advancements in understanding vitiligo pathophysiology.
  • To discuss emerging, evidence-based treatment strategies for vitiligo.

Summary:

  • Cutaneous hypomelanoses present varied etiologies, from developmental errors to inflammatory processes.
  • Understanding the molecular basis of pigment disorders is crucial for effective management.
  • Vitiligo, a prevalent acquired hypomelanosis, now benefits from guideline-oriented, evidence-based therapies.

Impact:

  • Improved diagnostic and management approaches for hypomelanoses.
  • Enhanced interdisciplinary collaboration for complex cases.
  • Development of novel therapeutic interventions for pigmentary disorders, particularly vitiligo.