I was given hydrophor to help with the healing of my skin - i applied right after each radiation treatment - and several times a day - but not first thing in the morning as my treatment was scheduled for 9 AM. i also used it for several months after my treatment ended. It can take over a year for scar and scar tissue to heal. I in addition to my lumpectomy I've had nepherctomy, an overectomy/appendectomy, as wells as several "minor' surgeries to remove fibroids and fibroadenoma. My lumpectomy was 2.5 years ago and the internal scar tissue is still a bit had and settling - though my outside scar is completely healed.
Light stretching and exercise of the area really helps with the tightness and healing.