Can a psoriasis patient donate blood?

Q: My brother is suffering from psoriasis for the past two decades. He is willing to donate his blood for a good cause. Can he donate his blood?

A:A patient of psoriasis can donate blood if he has no local lesions on his arm, the site from which blood is drawn and has not taken oral retinoids. The use of these drugs precludes blood donation by a psoriatic patient.