After reading my post to you I realise that it makes very little grammatical sense. My apologies. I was hurridly writing the post while at work, that is why it comes across like a stream of conciousness (and inaccurate to boot).
The conversion from Test to DHT is driven by an enzyme called 5-alpha reductase, which is produced in the prostate, various adrenal glands, and the scalp. These convert Test to DHT which is three times more potent than Test.
Erythema is commonly listed as one of the side effects of Test. My assumption is that the erythema that you are experiencing is brought on by a hypersensitivity to DHT in your system. Zinc and B6 have been shown to inhibit this conversion.
Arimdex is also known to cause hot flushes, but these are normally accompanied with sweating.
My apologies again for not giving a more in depth explination.