The main causes of white lumps on finger caps are vitamin or trace element deficiency, pathogenic microorganisms infection, hereditary diseases and so on. 1. Vitamin or trace element deficiencies: clinically, it is found that white lumps on the finger caps can occur after vitamin B or C deficiency, and the symptoms disappear after vitamin supplementation, such as hexavitamins. In addition, it is also found that calcium or iron deficiency will have a similar situation, also after supplementing calcium and iron, the symptoms will gradually disappear. The daily diet should be diversified, pay attention to vitamins and trace elements supplementation, and also should be moderate outdoor exercise, in order to facilitate the absorption of calcium. 2. Pathogenic microorganisms infection: such as fungal invasion of the nail bed can lead to white lumps on the finger cap, and the symptoms will be relieved after giving anti-fungal drugs such as fluconazole, itraconazole, etc. The symptoms can also be complicated by typhoid fever and other diseases. It can also be complicated by typhoid fever, leprosy and other diseases. 3. Hereditary diseases: such as complete white armor, belonging to autosomal dominant inheritance. There may be other reasons for the appearance of white spots on the finger caps, so, you should go to the dermatology department of the hospital in time and do the relevant examination, in order to clarify the cause of the disease and guide the treatment.