Thranduil's face?

[Varnafindë]

Originally Posted by Lefty Scaevola

I suspect that Elven healing can be impaired by a marred Fea, which Maidhros suffered a bit from, and which movie Thranduil appears to exhibit to some extent.

That could be a great part of Thranduil's problem.
Celebrian suffered from that as well - it's possible that her body got completely healed, but the marring of her fea couldn't be healed in Middle-earth, so she left for the West.