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Medical condition From Wikipedia, the free encyclopedia
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]
Casal collar | |
---|---|
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 sign is caused by a lack of the vitamin niacin (vitamin B3).[1] Seborrheic dermatitis may appear similar.[1]
Casal collar is named after Gaspar Casal.[3]
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