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Pigmentary changes often pass unnoticed in donkeys and they are rare. Localised pigmentary changes can be either abnormally exaggerated pigmentation (melanosis or even melanoma) or reduced pigmentation (vitiligo). The former may occur as acanthosis nigricans in areas of continued skin-to-skin contact such as the axilla and groin. It can also develop spontaneously in donkeys of all ages. Secondary loss of pigmentation can occur at sites of wounding, scarring or skin inflammation.
References
- Knottenbelt, D. (2008) Skin disorders In Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) The Professional Handbook of the Donkey, 4th edition, Whittet Books, Chapter 8
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