Since it is classical swine fever, at least so far, it has not been found that classical swine fever has crossed the boundary between humans and animals and become a zoonotic disease. However, it is possible that your father did not pull out the needle in time after using the syringe. In the vast rural areas, the environment for raising pigs is very bad. The skin of pigs is not disinfected before injection, and there are bacteria and some viruses in pigs. After the needle was pulled out of the pig, it stuck to your father. On the one hand, it is traumatic inflammation. On the one hand, some microorganisms that may exist in pigs are stationed in your father's wound through needles, so it is more troublesome than the inflammatory reaction caused by general trauma. As for how to treat it, let's go to a bigger hospital for a detailed examination.