Why Am I Experiencing Skin Peeling And Burning From Azithromycin And Deriva-C For Acne?

Hi I have severe acne on chest and cheeks due to puberty. I would describe them as small small pimples with hard solid pimple pus. The pimples are on the upper part of the chest and on shoulder, and on face chin and the cheeks and some on the forehead. my dermatologist prescribed azithromycin 500mg( twice a week ) and Deriva-C( every night before sleep ) for 2 months this medications are peeling the skin on my face and chest and i have a burning sensation when i touch the affected skin. what should i do..? Thanks