Microscopic examination of pustules usually shows budding yeast forms and spores, rather than the hyphae seen in tinea versicolor. Biopsy is rarely performed, but would show dilated follicular ...

Medically reviewed by Brendan Camp, MD Hyperpigmentation (skin that is darker than the surrounding skin) in the underarms can have several causes. Acanthosis nigricans (AN) is a common cause. AN ...

Hypopigmentation can also from when there's been an overproduction of a yeast on the skin called malassezia furfur (which causes the condition tinea versicolor) as well as "vitiligo, which is an ...