Dandruff (Seborrheic Dermatitis) is scalp flakiness and/or an inflammatory skin condition due to overgrowth of skin fungus. It is the most common cause of dermatitis (eczema-type) in adults. It can also cause diaper eczema in infants.
Pruritus is a a sensation that elicits a desire to scratch. Pruritus is the most common skin symptom, with underlying systemic etiology in 10-25% of patients