welcome to hcm.
We are here only to help you and please do not panic.
It would've very informative if u had mentioned the size of the fluid sacs and it doesnt mention if they have been developed at the same region where the injury
was sustained. and the lesions which ur mentioning in the armpit, it is very unlikely to develop after 4yrs. From the available history, it is very inappropriate to make a clear cut diagnosis and treat without visualising the lesions.
However, I would advice You to follow up with the doctor previously consulted and/or take another opinion from Consultant surgeon..
Kindly do the Lab investigations and follow up accordingly for the best treatment and kindly do not make a delay.
Hav a happy day:-)