muddy complexion

A characteristic patchy hyperpigmentation seen on the face in malnourished children, which is accompanied by pallor, lassitude, hypochromic anaemia, delayed epiphyseal development, delayed puberty, defects in dentition, anorexia, and increased susceptibility to infection
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

muddy complexion

A characteristic patchy hyperpigmentation, seen on the face in malnourished children, accompanied by pallor, lassitude, hypochromic anemia, delayed epiphyseal development, delayed puberty, defects in dentition, anorexia, ↑ susceptibility to infection. See 'Crazy pavement' appearance.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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She was not otherwise positively ill-looking, though anxious, meagre, of a muddy complexion, and looking as old again as she really was.
AT this time of year,between spring and summer, we are usually to be found desperately trying to slough off the muddy complexion of winter ready for summer's sun.