Why did lesions occur on my scalp? Lost hair overtime & been raw & not healing right (Photos)

Had Craniofacial implant on forehead through coronal incision. Caused infection so was removed but screws were left in. Over time the area frontal scalp was really raised until I took antibiotics then underwent weird skin changes. It's lost hair overtime and been raw and not healing right for months. It's also still mild swelling I have some screws still left in. Should've been removed. They're in upper left forehead as anchor points for brow lift. Symptoms is pain irritated inflamed etc