Rash after chemotherapy is mainly a side effect of chemotherapy, which is an allergic reaction to the skin caused by the application of chemotherapy drugs, and it is necessary to determine whether it is necessary to change the treatment plan by taking into account the degree of severity. The use of chemotherapy drugs will produce a series of side effects, such as bone marrow suppression, gastrointestinal disorders, liver and kidney function abnormalities and allergic reactions. Rash after chemotherapy is one of the allergic reactions. Generally, the allergic reactions are not serious and do not require too much intervention, and most of them will subside on their own, but if they continue to worsen or even cause skin ulcers, the drugs need to be changed if necessary. If you have serious intolerance during chemotherapy, you need to communicate with your doctor in time, seek medical checkups in time, and adjust the treatment plan under the guidance of the clinician to prevent unnecessary damage.