A mass is actually a type of mass on the body surface. It is very common clinically and mostly occurs in the neck, chest, back and limbs. Although some tumors are indeed breeding grounds for malignant tumors and will eventually turn into cancer if they persist for a long time or are constantly irritated, this cannot be generalized. Most of the masses that can be touched on the body surface are inflammatory masses or benign masses. These two types of masses only require regular monitoring and generally rarely have fatal risks. Determining whether a mass is benign or malignant is related to its size, shape, texture, tenderness, mobility, etc. If it is a benign mass, it is usually relatively large in size or variable in size, or even disappears on its own. It is regular in shape, has a smooth surface, and is soft in texture. It is fixed in one place and does not move up and down. At the same time, if the mass is pressed, it will still appear. There is obvious pain. In addition, if it is an inflammatory mass, there will usually be local redness, heat, and pain, and eventually it will suppurate, ulcerate, or subside on its own. It is often accompanied by signs of inflammation such as local pain and elevated white blood cell count. In fact, lumps that are painless, itchy, and asymptomatic are the most dangerous. But if you have a mass, even if it is benign, you cannot ignore it. You should check it regularly even if you have no symptoms. In addition to seeing a doctor, it is very important to learn to self-examine, which requires mastering very standard touching techniques. Put your fingers together and place the front of your fingers flat on the area to be inspected and touch it back and forth instead of grabbing or pinching it with your fingers. This will help us better identify the nature of the mass and enable early diagnosis and treatment.