My son has suffered from skin problems on his face and scalp for years. He has visited two dermatoogists and taken medications recomended with no improvement. He wonders if allergies might be the cause, but doctors seem to be uninterested in any talk of that. I knew a person with allergy to vinegar and he tried to stay away from it. So far flair ups have improved. Is this is possibility? He is 6 feet, 40 years old this May. I don;t know his weight but is over weight but not bad.