Itchy, rash

VSG 11/21, 91 pounds down from first appt with surgeon. This past week I have been itchy all over and I have a rash (red, raised, uneven edges) on my neck. I just had labs done a few weeks ago and all my results were within Normal range so I don’t think it’s a renal, liver or phosphorus issue. I stopped wearing necklaces, stopped using using creams and lotions ( cause they started to burn/hurt) and there has been no improvement. I noticed increased hair loss around the same time so maybe this is surgery related. Anyone else in the same boat?