Diagnosis of vitiligo
Normally the clinic is clear enough to establish a correct diagnosis of vitiligo , and can be helped by a light examination of wood . This test is performed by visualizing the skin with a small lamp that emits an ultraviolet light and presents a magnifying glass. Some dermatological lesions become phosphorescent when focused with a wood lamp. The electron microscopycan also show other changes in the affected skin.
Only in rare cases where there is still doubt about the diagnosis, a biopsy of the lesion is taken . In it, the absence of melanocytes mentioned above must be demonstrated; otherwise the skin is completely normal.
It is also advisable to perform a blood test to determine the concentration of thyroid hormones, and glucose to rule out other pathologies associated with vitiligo.
There are some skin lesions that can be considered similar to those of vitiligo and make the diagnosis doubt, because they also manifest as depigmented spots. This occurs in some injuries due to toxins, burns , in some professions (occupational vitiligo), some depigmentation after inflammation, some ringworm , acromic nevus, etc., but in the biopsy, melanocytes and melanin will be observed, unlike vitiligo.