Tinea versicolor fungus and brown spots on skin

The yeast associated with tinea versicolor affects the outer skin and can change how nearby pigment appears. The result is usually a flat area that contrasts with surrounding skin rather than a raised growth. Spots often occur across the chest, back, shoulders, neck, or upper arms, and may become easier to see after tanning because surrounding skin darkens.

Fine scale may be easier to feel than see when the skin is gently rubbed. Brown colour alone cannot confirm the cause: marks from inflammation, medicines, sun exposure, or other pigment conditions can look similar. A clinician can compare the pattern with [Dark Patches On Skin](/symptoms/dark-patches-on-skin/) and [Skin Rash](/symptoms/skin-rash/).

Arrange an examination if the spots are new, spreading, or repeatedly returning. Once tinea versicolor is confirmed, treatment is aimed at reducing yeast on the surface. A cream or medicated wash may suit limited areas; oral antifungal treatment requires a clinician to review medicines, pregnancy status, and relevant health conditions.

Apply products only as directed and keep them away from eyes and broken skin unless told otherwise. Avoid abrasive scrubs, which can irritate the area and make colour differences harder to judge. See [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) for the treatment category.

Seek medical care for a spot that is painful, bleeding, rapidly enlarging, ulcerated, or very different from the others. Fever, pus, marked swelling, or a rash near the eyes also needs prompt assessment. Do not assume every brown mark is fungal.

Ask whether the scale and distribution fit tinea versicolor, whether a surface test is useful, and how to tell active infection from leftover pigment change. Ask how to use a [Medicated Shampoo Treatment](/treatments/medical-dermatology/medicated-shampoo-therapy/) when the affected area is broad.