Skin problem. My face on shaving area.

I am suffering from a skin disease since last 6 yrs..a dermatologist diagonesed it as sebohiric dermotisis while other as mecullar amyloidosis and one other doctor diagones ed it as keratisis.I am totally get confused who is ryt.problem is : Some mini dots ocurred at my back (shoulder) which later converted in black patches with severe itching.it all started 7 yrs back. same mini dots spreading at my arm of both hand  and chest which later converted into black patches. If i eat eggs or takes tea itching increased in affected area and mini red boils also comes at my chest and back.These mini red dots disappear after 3 to 4 dots.skin in the affected area is very rough and itching all also contiue till i take levocitrizine. red rashes also occured at my face on shaving area .