Psoriasis can be a really tough disease, with no really great treatments in conventional medicine. HERB medicine may provide some relief. A recent study found that marijuana could substantially help control psoriasis. Psoriasis is a disease of too much skin cell replication (technically called epidermal keratinocyte hyper-proliferation), and involves an inflammatory process. Researchers found that these cells contain Cannabinoid receptors that can help control this growth. So cannabis is known to be both anti-inflammatory AND can activate these receptors. Of course there are a wide variety of side effects that it can cause for many people, like the munchies, uncontrollable laughing, relaxation, etc. Of course researchers are trying to make cannabis analogues that can activate the same receptors, but won’t cause such annoying side effects … oh and of course that is patentable… wait are we being paranoid? … oh yeah, that’s another side effect.
 
J Dermatol Sci. 2007 Feb;45(2):87-92