Drug exchange is also a basic surgical skill. For changing medications for infections and abscesses, the first thing surgery does is to drain them thoroughly. For larger abscess cavities, drainage tubes with negative pressure suction are used. For small abscesses, drainage strips can be used. There are many types of drainage strips, each serving a different purpose. Commonly used drainage strips are: 1. Normal saline drainage strips, which are suitable for general plasma exudate. (drainage of fluid, liquefied incision, or to prevent premature closure of the skin while the residual cavity is still present). 2.Furacilin drainage strips (same function as normal saline drainage strips). 3.Unlocker drainage strips, as you can see from the composition of chlorine, so there is a certain degree of corrosiveness, can be used to remove the necrotic tissue of the infected incision, with the effect of decay and muscle. 4.Iodoform gauze strips, which are similar to Ulocker, can be used for infected incisions. 5, high salt gauze, due to high osmotic pressure, can stimulate the granulation dehydration, fresh, but also has a bactericidal effect, can be used for infected incisions, and long time change of medication caused by aging edema of granulation tissue. 6.Vaseline gauze, can not play the role of drainage, mainly used for abscess incision, the residual cavity after the communication of each subcavity oozing blood. It can be used to stop bleeding after filling. Since it cannot play the role of drainage, it should be replaced with other kinds of drainage strips as soon as possible after stopping bleeding. 7.Iodine voltaic gauze is generally used to cover the incision. 8, alcohol gauze is generally used to cover the incision, because alcohol is irritating, can cause pain to patients, generally not used for drainage strips, filling the wound. 9, Levanore drainage strips: Levanore belongs to an antibiotic, (clinical generally do not advocate the use of local antibiotics). Levanore drainage strips are used in the same way as normal saline drainage strips. If a patient has diabetes and an abscess is formed, first of all, treat the abscess as early as possible after it occurs, smoothly lower the blood sugar, reasonably choose antibiotics, and at the same time, the local can be wet bound magnesium sulfate. After abscess formation, incision and drainage are performed, and intraoperative attention is paid to the communication of the abscess chambers. If there is more blood leakage, Vaseline gauze can be used to fill the abscess. After stopping the bleeding, you can use eucalyptus or iodoform gauze with certain corrosiveness to remove the necrotic tissue as early as possible to make the trauma fresh. High-salt gauze strips can be used when the dressing change is long and the granulation is not fresh. For more serious infected incisions, high-salt gauze strips can also be used directly for dressing changes with good results, which can be seen when the gauze strips are covered with purulent secretions while the wound surface is clean. The gauze strips can be directly cut into drainage strips of appropriate size and loosely filled into the pus cavity. It is most important for diabetic patients to use insulin to control blood sugar smoothly as soon as possible. The drainage strip needs to be cleaned and changed daily after insertion. Gradually withdraw the drainage.