临床资料本组13例男性,均因不良嗜好长期大量喝酒、偏食、食欲差,慢性酒精中毒致烟酸缺乏症。年龄:30～62岁,平均年龄44岁。喝酒时间6年～24年,平均12年。每人平均每天喝50度白酒350克至500克以上。症状与体征:13例均有皮肤干燥、皮疹、舌炎、两手背及腕部暴露处皮疹红斑或呈灰黑色,与末暴露处分界明显。13例均有口腔 Clinical data The group of 13 men, all due to bad habits long-term heavy drinking, partial eclipse, poor appetite, chronic alcoholism caused niacin deficiency. Age: 30 ~ 62 years old, average age 44 years old. Drinking time of 6 years to 24 years, an average of 12 years. Each person on average drink 50 degrees per day 350 grams to 500 grams or more. Symptoms and signs: All 13 cases had dry skin, rash, glossitis, erythema or gray rash on both hands and wrist. 13 cases have oral