just left the er with a friend the reason being is a lump under left arm they  cut it open to drain it.my concerns are she had a fever of 103 and also cancer is on both sides of her family, her grandmother had to have her left breast removed due to a lump under the same arm in the same place, but as soon as we got home another lump came up and is very red with streaks hot to touch. im really concered.
HI. The best way to rule out cancer is only BIOPSY. Request for excision biopsy. Continue antibiotics and supportive medicines she must have been given. Get her assessed after 1 weeks and 2 weeks, if the swellings do not subside, go for a biopsy.