Since you are a diabetic and undergoing dialysis,it means you are suffering from end stage renal disease
( ESRD ).
It is very common to find pigmentary changes in the skin of patients suffering from ESRD.
It is noted that 25-70% of dialysis patients are affected to some degree. Incidence increases with the duration of renal disease. The spectrum of pigmentary changes ranges from hyperpigmentation
to yellowish discolouration and pallor. Hyperpigmentation is often photodistributed and is the result of an increase in melanin in the basal layer of the epidermis
. The yellow skin colour in ESRD patients is caused by lipochrome and carotenoid
deposition in the dermis and subcutaneous tissues. Pallor is also as a result of anemia associated with renal failure
Although treatments like emollients and moisturisers are given,but they rarely have any affect,as in you.However renal transplant is supposed to be ultimate curative for not only hyperpigmentaion but also any pruritis,if associated.