Small bumps on the elbow are commonly caused by the following: First, skin allergies, when the body is exposed to some characteristic substances, such as cosmetics, paints, etc. will lead to the growth of local pimple-like swellings, through oral desensitizing drugs, while washing with water, but also need to get away from the allergen to help relieve the symptoms. Secondly, folliculitis, which is often caused by friction or contact with unclean things, can be coated with topical drugs such as iodophor or Bactrim, which can relieve the symptoms. Third, sebaceous cysts, which is an infectious disease, need to go to the hospital to improve the relevant examination to perform surgical removal. Fourth, there are some other possibilities, such as mosquito bites, which can be applied locally with baking soda or toothpaste to relieve the symptoms; there may also be swollen lymph nodes. If the swelling persists, you need to go to the hospital in time to clarify the cause.