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  Dandruff   It is a skin condition that mainly affects the scalp. [1] Symptoms include flaking and sometimes mild itchiness. [1][2] A more severe form of the condition, including inflammation, is known as seborrhoeic dermatitis. [1] The main symptoms of dandruff are an itchy scalp and flakiness. [ 3 ] Red and greasy patches of skin and a tingly feeling on the skin are also symptoms. [ 4 ]                         A microscopic image of human dandruff [19] Signs and symptoms The main symptoms of dandruff are an itchy scalp and flakiness. [20] Red and greasy patches of skin and a tingly feeling on the skin are also symptoms. [21] Dandruff and dry scalp are often confused since they share many of the same symptoms, but their causes and treatment are different. [22] A dry scalp is simply dry skin on the scalp. Treatment is with a skin care regimen.  Causes : Dandruff with shed hair can be symptomatic of dry skin  The cause is unclear but believed to involve several genetic and environmenta