Risk of a Hypertrophic Scar on Chest Becoming a Keloid with Revision?

the steroid injection did flatten the scar some but i hav how the scar is a long line about an inch long and still red and kind of wide now that its gone down. I am really interested in having it excised and sewn up less noticeably my plastic surgeon says i have to wait until it heals up before excising it. Am i at risk for it growing back in form of a keloid? will it look less noticeable? any advice will really help thanks so much!