Haha it's a mosquito bite gone bad.

There is an interesting podcast, Emcrit I think, where one of the lead researchers from the drug company talks about the drug. He states the drug doesn't work. He goes into detail about the biochem behind it and how all the textbooks are wrong. Says they have to start completely over now. The drug was developed based on a misunderstanding. Sadly, the drug company is still marketing and promoting in attempt to recoup money.