I Am Looking For A Dermatoloy Doctor To Name What

i am looking for a dermatoloy doctor to name what ever i have .i have used dr.holder. he put it under a scope but never told me . i have tried everything he gave me . said he had one that we have not use but cost was 600 dollars. ihave had this for 4years. need to see i would like poeple to not stare .they may get. it like a pimple. and rash itches. i have done all the home remedy