Casal collar

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Casal collar
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A boy with casal collar caused by pellagra
Specialty Dermatology
Symptoms Redness and darkening around neck [1]
Causes Pellagra [2]
Differential diagnosis Seborrheic dermatitis [1]

The Casal collar or Casal necklace is a medical sign in which there is a redness and darkening of the skin around the neck, seen in people with pellagra. [2] It becomes prominent following exposure to sun, and can be itchy with a burning feeling and pain. [1] It can blister and weep, and turn into thick dark skin, with a coppery hue. [1] If prolonged, the skin becomes thin, dry and smooth. [1]

The sign is caused by a lack of the niacin (vitamin B3). [1] Seborrheic dermatitis may appear similar. [1]

Casal collar is named after Gaspar Casal. [3]

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References

  1. 1 2 3 4 5 6 7 James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020). "22. Nutritional diseases". Andrews' Diseases of the Skin: Clinical Dermatology (13th ed.). Edinburgh: Elsevier. pp. 479–480. ISBN   978-0-323-54753-6.
  2. 1 2 Johnstone, Ronald B. (2017). "4. Psoriasiform reaction pattern". Weedon's Skin Pathology Essentials (2nd ed.). Elsevier. p. 65. ISBN   978-0-7020-6830-0.
  3. Stedman, Thomas Lathrop (2005). Stedman's Medical Eponyms (2nd ed.). Lippincott Williams & Wilkins. p. 126. ISBN   0-7817-5443-7.