The word of the day is eczema:

Etymology:  < Greek ἔκζεμα, < ἐκζεῖν, < ἐκ out + ζεῖν to boil.

Pathol.

 

  ‘An acute, or chronic, non-contagious, simple inflammation of the skin, characterized by the presence of itching papules and vesicles which discharge a serous fluid, or dry up’ ( New Sydenham Soc. Lexicon). There are many kinds of eczema; a form occurring in cattle (E. epizooticum), is known as ‘the foot and mouth disease’.  (OED)

"They tromped west, skirting the reservoir, past an enormous eczematous London plane - more wood in it, Barnard wagered, than in any other Park tree - and a grove of red oaks that had often been mistaken for black oaks."

 - Nick Paumgarten, "Dept. of Maps: Very important trees", 31 January 2011 The New Yorker