If you have blisters at tip of fingers and dry skin
then you need to rule out certain conditions
such as diabetes, psoriasis, hypothyroidism, contact dermatitis, atopic dermatitis and malnutrition.
Generalized itching can be due to allergy. Common allergens are pollen, mold, dust, pet dander, synthetic fiber, food, cosmetics (powders, soaps, shampoos—see if anything was recently changed) or drugs. Food allergies like to gluten, lactose, sea food, and alcohol etc too should be looked into.