Had Gastric Sleeve 2 Yrs Ago My Body, Mainly Lower

Had gastric sleeve 2 yrs ago my body, mainly lower abdomen, sides of breast, under arms, pubic area, inside belly button extremely itchy all the time been to a couple dr.s, my primary Dr. and Gyno Dr. and cant seem to figure out why. Been on prednisone, treated for scabies(but was not scabies). Also had sever itching on both sides of outer part of virgina. Had biopsy of skin and cant find anything.