Today, I went to the ward to consult a 73-year-old male patient who said he had a skin swelling in his lower left abdomen that had been there for decades. The doctor in charge was worried that it was a skin tumor and asked for a dermatology consultation to give a recommendation. The moment I lifted my shirt, I was also shocked: such a big pimple! I only saw a swelling in the lower left abdomen, blue-black, hemispherical, egg-sized, relatively hard in texture, no pressure pain, able to push, and there was a small hole in the center of the swelling, similar to the pupil on the eye, through which the substance inside could be seen, hard, black substance, similar to a piece of coal carbon, and the skin on the surface of the swelling was thin, and several radially arranged capillaries could be seen. According to the clinical presentation and medical history, this disease is called “sebaceous cyst”, commonly known as “powder tumor”, because the discharge of sebaceous secretions is obstructed, and the accumulation becomes more and more, forming a swelling under the skin, in fact, the formation of the cause is the same as blackhead acne. The development of sebaceous cysts is relatively slow, and when they are first discovered, they may only be the size of a green bean to a soybean, and they are not painful or itchy, so few people pay attention to this matter. As time goes by, the swelling will get bigger and bigger, and generally when it grows to the size of peanut rice, people pay attention to it and remember to go to the hospital to have a look, worrying about tumors, cancer and so on. The treatment of sebaceous cysts is also very simple, surgical removal can be done. However, during the surgery, the cyst wall of the swelling must be removed intact, otherwise it will recur and you will have received this knife for nothing. Before surgery, a powder tumor is in the shape of a ball, soft and not itchy or painful. If there is a hole in the center, it will squeeze out a white bean curd-like substance that stinks and deflates after squeezing, and grows back to its original size after a while. Never squeeze it for nothing, if the cyst is accidentally crushed, it will show local symptoms of infection, redness, swelling and pain will appear within a day. It is too late to choose to do surgery at this time, you must first anti-infection treatment for two weeks, and then choose to do surgery after the infection is controlled. And this grandpa’s pink tumor existed for quite a long time, and the water inside was gradually attracted, and it would also become harder and darker, and finally it became such a shape. The family asked me: Do you want to treat it? My answer was: It does not affect health and can be treated or not. The family members waved their hands: Forget it, it’s too old to withstand the torment, so I won’t treat it. In fact, for small powdery tumors with a diameter of less than 5 mm, you can use laser treatment to burn a small opening to drain the contents, and then clip out the cyst wall with tweezers, which will not leave scars. If it’s a larger pink tumor, you need to have surgery as soon as possible to avoid the trouble of accidentally breaking it one day. Check quickly to see if you have such a small swelling on your body.