The hard bumps on the hands may be caused by common warts, dermatofibroma, folliculitis and other diseases, which can be treated by physical therapy, surgical treatment, medication, etc. The most important thing to remember is to make sure that you have a good understanding of what you are doing. 1. common warts: common warts patients with hard bumps on the hands, you can carry out cryotherapy, low temperature liquid nitrogen role in the warts, warts destroyed tissue, make the hard bumps subside, you can also carry out laser treatment, through the burn warts to make the shedding. The actual warts can also be treated with a scraping procedure when the number of warts is small. 2. Dermatofibroma: Dermatofibroma patients can be liquid nitrogen cryotherapy, through the low temperature liquid nitrogen to the lesion area of the cell death, to remove the effect of dermatofibroma. Some patients can also undergo surgical treatment to remove the lesion. 3. Folliculitis: hair follicles are infected by pathogenic bacteria such as bacteria caused by inflammation, can be prescribed by the use of fusidic acid, clindamycin metronidazole gel and other topical treatments, pay attention to local cleanliness, avoid staying up all night, the use of spicy and stimulating food, and so on. There are many reasons for the hard bumps on the hands, it is recommended that the patient to the hospital for examination, under the guidance of the doctor according to the condition of standardized treatment.