The Collaborative International Dictionary of English v.0.48:

malanders \mal"an*ders\ (m[a^]l"an*d[~e]rz), n. pl. [F.
   malandres, fr. L. malandria blisters or pustules on the neck,
   especially in horses.] (Far.)
   A scurfy eruption in the bend of the knee of the fore leg of
   a horse. See Sallenders. [Written also mallenders.]
   [1913 Webster]