Assess serum and tissue retinol binding protein 4 in patients with severe alopecia areata in correlation with healthy individuals . Estimate genetic profile of retinol binding protein4 in severe alopecia areata patients Assess possible role of retinol binding protein 4 genetic mutation in response to barcitinib treatment in patients with severe alopecia areata .
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Assess serum and tissue retinol binding protein 4 in patients with severe alopecia
Timeframe: baseline