This to me seems like absolutely terrible advice.
+1
It does not look like lympho to me, nor would lympho typically show up so severe overnight. And I agree with Jamie, it's near impossible to accurately ID a disease from a photo, especially a poor photo. Sometimes even in person one is only guessing unless they take a sample & place it under a microscope, and actually know what to look for.
Glad to hear that he's doing better ........