I have got pimples all over my face.. I changed my dermatologist twice since they proved me of no help?

Hello I am a 25 years old female.. I have got pimples all over my face.. I changed my dermatologist twice since they proved me of no help and have taken every possible medicines bt of no use.. My wounds won’t heal soon.. I have undergone every possible test related with the same like Blood,thyroid,sugar,HB,some test related to kidney function as well.. Yet the tests proved nothing wrong. My body is functioning all good.. I really don’t know what’s wrong with me.. My face is still full with pimples and dark spots.. I look ugly as hell.. If you have any solution then please help..?