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White Spots on the Skin – Causes & Treatment

White spots on the skin can result from various causes, ranging from harmless pigmentation changes to conditions requiring medical treatment. Early evaluation by a dermatologist is recommended.

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Things worth knowing about "White Spots on the Skin"

White spots on the skin can result from various causes, ranging from harmless pigmentation changes to conditions requiring medical treatment. Early evaluation by a dermatologist is recommended.

What Are White Spots on the Skin?

White spots on the skin are areas of reduced or absent pigmentation that can vary widely in size, shape, and distribution. They develop when melanocytes – the pigment-producing cells in the skin – are absent, damaged, or produce less melanin than normal. Melanin is the natural pigment responsible for the color of skin, hair, and eyes, and it also helps protect the skin from UV radiation.

Causes

White spots on the skin can be triggered by a wide range of conditions:

Vitiligo: An autoimmune condition in which the immune system attacks and destroys melanocytes, leading to sharply defined, milky-white patches that can spread across the body.
Pityriasis versicolor: A common fungal skin infection caused by the yeast Malassezia, resulting in lighter or darker spots, often on the trunk.
Pityriasis alba: Mildly depigmented, slightly scaly patches seen primarily in children and adolescents, often associated with atopic dermatitis (eczema).
Scar tissue: Healed wounds or resolved inflammation can lead to localized loss of pigment, known as post-inflammatory hypopigmentation.
Idiopathic guttate hypomelanosis: Small, white macules commonly appearing on sun-exposed areas of older adults.
Congenital hypopigmentation: Conditions such as albinism (absent melanin production throughout the body) or localized depigmented birthmarks (nevus depigmentosus).
Tinea corporis: A ringworm fungal infection that may occasionally cause skin lightening.

Symptoms and Appearance

The appearance of white spots depends on the underlying cause:

Sharply defined, milky-white areas (typical of vitiligo)
Mildly lightened, poorly defined patches with fine scaling (typical of pityriasis alba)
Small, round, uniform spots on sun-exposed skin (typical of idiopathic guttate hypomelanosis)
Areas accompanied by itching or flaking (possible with fungal infections)
Spots that become more noticeable after sun exposure compared to surrounding tanned skin

Diagnosis

Diagnosis of white skin patches is primarily carried out through a dermatological examination. The following methods may be used:

Wood lamp (UV light): Under ultraviolet light, vitiligo lesions appear bright white-blue, while fungal infections may show characteristic fluorescence.
Dermatoscopy: Magnified examination of the skin structure.
Skin swab or biopsy: In cases of suspected fungal infection or for histological analysis.
Blood tests: To rule out associated autoimmune conditions (e.g., thyroid disorders commonly linked to vitiligo).

Treatment

Treatment depends on the underlying cause:

Vitiligo

Topical corticosteroids to suppress immune activity
Calcineurin inhibitors (e.g., tacrolimus) as an alternative to corticosteroids
Narrowband UVB phototherapy
JAK inhibitors (e.g., ruxolitinib cream, approved since 2022)
Cosmetic camouflage for aesthetic coverage

Pityriasis versicolor

Antifungal shampoos, creams, or oral medications (e.g., ketoconazole, fluconazole)

Pityriasis alba

Moisturizing care and mild topical corticosteroids; condition is often self-limiting

Post-inflammatory hypopigmentation

Often resolves spontaneously; sun protection is recommended to prevent further contrast

When to See a Doctor

Medical consultation is advisable if:

new white spots appear or existing ones grow in size
itching, pain, or scaling accompanies the spots
spots appear on the face or other visible areas and cause distress
additional symptoms such as fatigue or thyroid problems are present

References

Ezzedine K et al. - Vitiligo. The Lancet, 2015; 386(9988):74–84. doi:10.1016/S0140-6736(14)60763-7
World Health Organization (WHO): Skin conditions – Vitiligo overview. Available at: www.who.int
Hay RJ et al. - Skin Diseases. In: Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill, 2022.

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