the male is stressed, for sure. i would be with a tail like that. that kind of looks liek a burn. is that some form of antiseptic cream on it or is that skin? looks liek its rather irritated could be part of a retained shed as well. i would boost humidity to 70-80% and treat it with some polyspourn. if it does not start to look better in 3-5 days i would get to a vet asap. 3 common options are, a burn, scale rot or retained shed that is causing irritation.

does it look like some shed has stayed behind? if thats not some form of cream treatment you have applied id say most deafinitly yes. its usually not an issue unless the retained shed is all the way around and not just on the back. and tails can be problematic for retaining them and forming irritations due to the fact.