What are those new lump ? The cancer spread so quickly?

My mother is having new little lump on back side of her neck ( place where we put pony tail ). She was diagnosed with sick cancer in breast stage 3 on July 2020 and we did surgery and took the breast completely. It was spread on nearby underarm lymph node also.
We gave her radiotherapy on September - October 2020.
What are those new lump ? The cancer spread so quickly ?

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  1. Fibroid

  2. Asthma

  3. Diabetes 1/2

  4. Cancer stage 1/3

  5. Hepatitis B

  6. Herpes

  7. Lupus

  8. HPV

  9. Fibromyalgia