I apologize if someone has already brought this up-- but do you think it's possible you might have "barber's itch", caused by a fungus tine barbae? Dandruff is often caused by a fungus, too.... Since it seems you already tried numerous antibiotics, I'm wondering if it could be a fungal infection. Maybe if you were able to get the right doctor, someone could do a culture on one of the lesions. They look really painful!
Not to make you try yet another thing, but maybe nizoral would help, or anti-fungal cream.