achromasia

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. Absence of normal skin pigmentation (from bruising, stress or disease); pallor or achromia
• n. The inability of a cell or tissue to be stained

from The Century Dictionary and Cyclopedia

• n. In pathology, lack of pigment in the skin.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. unnatural lack of color in the skin (as from bruising or sickness or emotional distress)