Hi,
Glad to know that your mom’s Ultrasound and biopsy procedure resulted in benign findings. Congratulations!
The cells inflammation in the axilla area can be due to many nonthreatening causes, and your mom shouldn’t be worried about it. This could often happen from shaving or folliculitis, also viral infections and the usage of antiperspirants (as opposed to deodorants) etc.
So, if your mother’s tests (especially the biopsy) showed that there are no malignant cells existing, then be assured that cancer is definitely ruled out.
Best wishes to both you and your Mom.