For you...Others may have had different experiences.
There was a very long discussion between Roberts, oswoldo and I about the relationship between estro and acne. In the end we didn't prove anything.

But there are alot of us that believe high estro levels MAY contribute...When my acne was at its worst, so was my gyno and bloat.
I think you forgot the original question. Will there be any consequences for him if he takes Arimidex throughout. I say no. In other words,
it would be better for him to take the arimidex, keep the estro under control, and hope for the best with his acne VS not taking the arimidex at all.
The benefits will far outweigh the negatives.