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Skin Cancer01:30

Skin Cancer

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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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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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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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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Related Experiment Video

Updated: Mar 2, 2026

Precision Implementation of Minimal Erythema Dose MED Testing to Assess Individual Variation in Human Inflammatory Response
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[SOLAR URTICARIA].

Fareed Sabbah1, Emmilia Hodak1, Assi Levi1

  • 1Photodermatoses Clinic, Department of Dermatology, Rabin Medical Center, Petah Tikva, Israel.

Harefuah
|May 23, 2017
PubMed
Summary

Solar urticaria is a rare skin condition causing itchy welts upon light exposure. Early diagnosis and management are crucial for improving patients' quality of life.

Area of Science:

  • Dermatology
  • Immunology

Background:

  • Solar urticaria is a rare photodermatosis and a type of physical urticaria.
  • Characterized by rapid onset of erythema, whealing, and pruritus after light exposure.
  • Significantly impacts patient quality of life, necessitating accurate diagnosis and management.

Purpose of the Study:

  • To describe a characteristic patient with solar urticaria.
  • To review the epidemiology, clinical manifestations, etiology, diagnosis, treatment, and prognosis of solar urticaria.
  • To highlight the challenges in diagnosing and treating this rare disease.

Main Methods:

  • Case presentation of a solar urticaria patient.
  • Comprehensive literature review on solar urticaria.
  • Analysis of epidemiological, clinical, etiological, diagnostic, therapeutic, and prognostic data.

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Main Results:

  • Solar urticaria presents with immediate cutaneous reactions upon light exposure.
  • Diagnosis relies on patient history, physical examination, and phototesting.
  • Treatment and prognosis vary, often requiring a multidisciplinary approach.

Conclusions:

  • Accurate diagnosis of solar urticaria is essential for effective management.
  • Treatment strategies should be individualized based on disease severity and patient factors.
  • Further research is needed to improve understanding and therapeutic options for solar urticaria.