If the lumps are new, I might have them looked at. When is you next doctor visit?
My scar is a bit of a mess too. The top 1/2 is a very nice, thin, barely visible line, but the bottom half over the lower sternum developed as a keloid - raised, reddish, irregular, itchy (very much so at times) and somewhat tender. It is lumpy and I THINK those lumps are over the wires. I have an outstanding dermatologist. He made absolutely nothing significant out of my scar's oddball appearance, just noting that it happens. He was willing to shoot it with steroids, which sometimes helps reduce the keloid and itchiness, but also can produce a sunken scar. I once had a bad scar from a bicycle crash. It was kinda like the keloid potion of my sternotomy scar. Over 20-30 years it faded essentially completely away. I'm hoping my current scar fades and a bit more rapidly than that. It's been over 2 years and I'd say it peaked maybe 6 months ago, but if it is fading, it's only a few per cent so far.