Can unholy dks control diseases or do they just spread them? Curiosity for reasons on if a dk can remove or suppress a disease?
In MoP and WoD, all DK specs had access to a talent called Plague Leech, which allowed us to remove diseases we had inflicted on enemies. It was removed in Legion.
In Legion and BfA, Unholy has access to a talent called Ebon Fever that shortens the duration of its disease in exchange for a damage buff.
Though, I’m not sure if this answers your question.
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There is no unholy , frost or blood lore. There is DK lore and they spread the disease via magic means and natural undead. They do not suppress it, it’d go against their will to inflict pain.
Think a champion of Nurgle.
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Nah, BLOOD FOR THE BLOOD GOD!
I would say we are closer to an armoured necromancer than a warlock. Hence we spread disease and pain. 
There is because they have 2 schools for it and preach about their abilities as if they have 3 disciplines.
But other than that not much, we know they have schools for the 3 different specs but that is mostly all.
Do you mean schools as in damage type? If so then they have 3, Frost, Unholy/Shadow, and Physical.
If you mean school in a different way then what I said just doesnt matter though I dont quite understand.
yes, I typoed, they have 3.
Its a school of X type of magic, not a spec.
Really bro
i think it does, perfectly
they being those kind of magic manipulators are able to do that, those talents only prove they can do it.
if they Want to… its another question, and they do not have now just because of gameplay things.