If there is a hard bump on the belly, if the bump is exposed on the outside of the skin, it is recommended to register for dermatology. It may be a swelling on the surface of the skin, such as warts, folliculitis, hard nodules on the surface of the skin, etc., which can be removed by topical dermatological medication or laser treatment. If it is under the skin and not visible outside, it may be a superficial swelling under the skin or a tumor in the stomach, etc. In this case, general surgery can be registered. Further examinations, such as local ultrasound or even CT examination of the whole abdomen, must be done to clarify the diagnosis and, if necessary, to remove it by surgery.