Ay, that sounds like it could be post-surgical pigmentation or part ng keloid itself na nag-darken, which is normal sa healing pero kailangan mo talaga i-check with your OB para sure kung ano exactly yun, keloids can look different as they mature, at some moms get darker spots underneath. Para sa peace of mind mo and to see if may treatment options, best approach is mag-follow-up lang sa doctor mo since 11 months na siya, girl!