Radiotherapy scarring

I had a 5 day course of radiotherapy in December 2023 and my breast has been hard and tender ever since. I have recently noticed a hard band or long lump underneath . Am assuming some sort of scar tissue. Has anyone had similar.

I have had a similar thing happen, so am assuming it may be common for some people who go through the radiotherapy despite following advice to moisturise through out. I suspect it is another one of those things that they do not feel is necessary to let you know about when they recommend it.