Psorasis is caused by demodex mites, they are microscopic spiders. Our body acts wonky because it is under attack and compromised. The medical community is treating the symptoms and not telling patients what the cause's are. Part of the cause is our immunity is already weakened so the demdex miites can get an easy meal off of us, that in turn further depletes our immune system. That being aid there are similarities and I assume differences as people react differently to different treatments. Chronic diseases/illness rarely have a legitimate cause, just syptoms that are labeled as causes they say "we don't know". But they do know, all the medical information I have shared on this site I found in government health records/sites. Dr.s are not telling their patients. demdex mites is generic, dandruff may be one kind, psorasis another but both are microscopic spider mites. Maybe some dandruff is different that other and some psorasis different from others but they are all demodex mites.