Can Prozac Cause Lumps Under Armpit And Weight Loss?

my daught developed a pea sized lump under her armpit about november 2010. I was concerned about it and got her to see her doctor who dismissed it even though she had had a low white blood cell count on a blood test a month earlier. He told her to only come back when it was the size of a grape. I have just noticed as she was drying her hair that it has doubled and there is now another small lump further down her arm. I have managed to persuade her to go back to gp. She has lost a lot of weight but was put on prozac a year ago and this is when her weight started to come off.She has just stopped taking the prozac for two weeks now and her appetite has returned> could prozac be anything to do with the lumps?