White spots that become noticeable in summer are not always vitiligo, and the reason can vary. The contrast is often more obvious after surrounding skin tans.
Common causes
Tinea (pityriasis) versicolor: A common superficial yeast overgrowth that causes lighter—or sometimes darker—patches, often on the chest, back, shoulders, or neck. The spots may have very fine scaling and can become more noticeable after sun exposure.
Post-inflammatory hypopigmentation: Skin can remain lighter after eczema, irritation, insect bites, or other inflammation.
Pityriasis alba: Mild, pale patches, particularly on the face, that are common in children and young adults.
Vitiligo: An autoimmune condition in which pigment-producing cells are lost, producing sharply defined white patches. It can affect the face, hands, around body openings, and other areas.
Sun-related changes: Some small pale spots can appear with cumulative sun exposure, particularly as people get older.
How are they treated?
The treatment depends on the cause. For tinea versicolor, a dermatologist may recommend an antifungal cream or medicated wash. Vitiligo has different treatments, including prescription topical medications and phototherapy. Post-inflammatory patches often gradually regain their normal color once the underlying irritation is controlled.
Using broad-spectrum SPF 30+ sunscreen helps prevent tanning from making the contrast more pronounced and protects the affected skin.
If the patches are spreading, completely white, sharply defined, itchy/scaly, or persistent, a dermatologist can usually distinguish the causes with a skin examination and, when needed, a simple examination such as a Wood’s lamp.
Don’t automatically treat white spots with antifungal medication or steroid creams without knowing the cause—the right treatment depends on the diagnosis.
