Hi I just bought some guppies today and placed 2 female and 5 male together in a tank. After half a day, I noticed one of the female guppy has this huge white bump on one side of the body. She looks very active, maybe slightly over.. she is also not eating during her dinner feed after I isolated her from the rest. I’m not sure if she is infected or injuried, hence I placed her in isolation tank. I took some photos of the bump. Can anyone pls tell me what could be the possible causes?