Skin diseases (eczema /psoriasis etc..) tend to happen since they are auto immune and you already have one auto immune disorder .
Once you have one auto immune disease you tend to have more pop up .
Stopping humira clears the skin disease in 33% of the cases, makes the skin disease worse in 33% of the cases and leaves the skin disease the same in 33% of the cases which is why typically they just treat the skin disease and keep the humira.
Given the humira has been on board for 5 years - it may be just becoming less effective hence the skin disease