Infections to surgical wounds often lead to rashes after the operation, notes eMedicineHealth. In other cases, patient responses to certain drugs also produce a rash. In either case, reporting the rash to the doctor is a must.
Two bacterial infections that arise from some surgical wounds are staphylococcus and pseudomonas. In addition to rashes, pseudomonas also turn nails green, depending on the location of the infection. Antibiotics are the most common treatment for this type of infection. However, if the infection is staphylococcus, it can progress into flesh-eating bacteria if not treated quickly, as stated by WebMD. In the case of allergic reaction to a medication, the treatment is up to the physician.