Can fungus be the cause for itchiness all over body especially arms and head with no signs of hive redness or dandruff tingly feeling and itch tests?

Generalized pruritus. Pruritus, or itch, is defined as an unpleasant sensation that provokes the desire to scratch. Certain systemic diseases have long been known to cause pruritus that ranges in intensity from a mild annoyance to an intractable, disabling condition. Generalized pruritus:renal pruritus, cholestatic pruritus, hematologic pruritus, endocrine pruritus, pruritus related to malignancy, and idiopathic.