I'll open by saying I'm something of a layman, not having done any real research on the subject since the early 1990's.
I'm reading through Peter Heather's Fall of the Roman Empire, and I came across an odd contradiction. I've read that Numerian died of an eye disease on the Persian front, which might have been poisoning by Aper. The Epitome De Caesaribus backs this up.
However, Heather claims Numerian was captured by Shapur, killed, and his skin made into a bag.
Heather's source is Dodgeon's Roman Eastern Frontier and the Persian Wars, and Dodgeon appears to be quoting Malalas:
I know there are real concerns about Malalas' work. Is there any credibility to his account?