Hypopigmentation is the loss of skin color. It is caused by melanocyte depletion — a decrease in the amino acid tyrosine, which is used by melanocytes to make melanin.
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Hy·po·pig·men·ta·tion n. Diminished pigmentation, especially of the skin. Hypopigmentation A skin condition that occurs when the body has too little [more]Hypopigmentation - Community and Resources