Several causes: A "scab" is a rough protective crust the forms over a cut or wound. But when it comes to the scalp, most scabs don't come from a condition itself but result from repeated scratching which injures the skin. Conditions such as eczema, dandruff and psoriasis cause irritation of the scalp,which in turn causes scratching and then scab formation. SEE: http://bit.ly/1BDp67O and http://bit.ly/1yC8iSn
Answered 11/29/2017
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