Indented wide dark scar from recent cyst removal punch excision by plastic surgeon. Does it look normal? (Photo)

After 7 days, stitches were removed. Scar was light, looked good, small line. Now day 4 since stitches out, line much darker, deeper, wider. PS said maybe infection, so given antibiotics. Is there any hope this will flatten out/lighten up? PS is stumped, and I cant find anything like this on the internet to compare to. Please help, I am very scared I will permanently be disfigured, and I don't know how to treat it in the mean time to speed up healing and not mess it up further. Thank you.