Ustekinumab
"Stelara is an excellent medication.  I first contracted psoriasis through strep throat.  I  was covered in red spots from the neck down. Previously, I used a medication that cleared it up but it was harsh and made my hair fall out! I switched to Stelara and it cleared it up within days, I kid you not.  The only side effect has been fatigue and maybe a mild case of depression (which I'm not sure can be attributed to the Stelara).  

I'm only giving it a 9 because it won't clear up the patches on my face AND it is very expensive (right now the cost is 19,000 but Johnson & Johnson is covering it).   Highly recommend though."