I think that Nik may have a TOUCH of eczema on his body. Maybe on the backs of his hands or in the crook of his arms and neck.
Either way, it’s a pain in the ass when Summer and Winter roll around and he runs out of his medicated cream because his skin gets all dry and cracks or it flares and he ends up with gashes in those areas from scratching it so much.
Luckily for him, John is always there to help!
He’ll make sure he always has his cream when he can, and if he starts to scratch at those areas he’ll move his hand and rub gently at the spot to soothe it. If Nik manages to scratch a gash however, he’ll run it under cold or warm water. (Nik likes scolding hot water but knows that the other two options are best for him.)