TLDR Psoriasis on the scalp causes smaller oil glands and thinner hair but doesn't lead to hair loss.
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January 2014 in “Medical Innovation of China” 
12 citations,
July 2011 in “European Journal of Dermatology” The VSCAPSI is a helpful method for evaluating the severity of scalp psoriasis.
15 citations,
May 1989 in “PubMed” Psoriasis on the scalp causes smaller oil glands and thinner hair but doesn't lead to hair loss.
