Aw, normal lang yan mama! A few of us have had toddlers na may bumps or marks na tumatagal, lalo na kung medyo malalaki ang bukol or kung may skin involvement, it can take weeks to months para completely mawala, especially visible pa rin kapag nag-frown or kukunot. Pero since nag-improve na siya and the bump's mostly gone, that's a good sign na healing okay lang. If you're worried pa rin or kung lumaki ulit or may pus, best to check with your pedia just for peace of mind!