lump from injection site - dangerous?

[Hideyo Yamamoto]

Hi, I need your help --- I just noticed that my Dharma, whom I have been treating for possible FIP, developed a lump around neck shoulder area --- I have been giving different injections, interferon, sub q fluid, vitamin B.. and etc.. and am not sure exactly if this is the location.. but I am wondering if it’s caused by injections .. and if so – should I worry about this? I heard  before that injections (any) can cause cancers and I am very worried..now.. I would appreciate any insights… thank you!   Hideyo