@turquoise- Breast cancer can increase the risk of breast cellulitis for several reasons. One is if a woman has surgery for breast cancer. There is always a risk of infection with surgery and that's how most women develop breast cellulitis.
Radiotherapy can lead to breast cellulitis if cracks develop on the skin through which bacteria enters. Chemotherapy and radiotherapy also weaken the immune system which increases the likelihood of infection.
The important thing is taking notice of the symptoms and seeing a doctor right away. As long as it's treated quickly, breast cellulitis doesn't cause major problems.