Glad you mentioned the eczema. This could be a factor. Perhaps you could work on this -- let us know if you'd like some suggestions.
I would expect a 14mo old to be taking only one nap per day. Dr Spock has a great section on helping a baby go from two naps to one.
You might want to try a Didymos-type wrap -- here are some images: http://www.sabcollective.com/?p=1259
One of my children had a great deal of difficulty ramping down to go to sleep, and on a really difficult day I would wrap him up in this way, close the "curtains" of the wrap, sing, and walk up and down the hall for a few minutes. He did cry for a couple of minutes -- he wanted to stay awake and not miss a moment of action! -- but this method was the most painless for all concerned. Once he was asleep I could kneel down, lean forward until he was lying on his back on the low bed, and untie in the back, until we were untangled enough for me to stand up. The tie would remain tangled with him on the bed.
Another idea is, if he's lying on his side, jiggle his shoulder, vigorously if necessary. It will be kind of like how some adults love falling asleep on a moving train.
Perhaps some ambient sound will be helpful. We have a Sound Scape; you press a different button and get a different sound loop, such as white noise, heartbeat, waves on a beach, etc.
You might like to read about sensory integration, and try to figure out if there's some sensory defensiveness or sensory seeking going on. That could give you some ideas about how to satisfy his sensory needs.
As he gets older, you may be able to help him learn to release his tension before falling asleep in a less frightening way, by letting out a long, audible sigh during the exhale. I'm not sure how old he'll need to be to start learning this, but when the time comes, model it for him, and hope that he copies you.
Do you notice any patterns in terms of what increases or reduces the crying before sleeping? For example, being short on sleep, having had a lot of stimulation or frustration, fresh air, exercise, boredom, and so on.
Does your toddler get screen time? If so, how much, and what sort?