White patches on the skin (known as hypopigmentation or depigmentation) occur when there is a decrease or loss of melanin, the natural pigment that gives color to the skin, hair, and eyes. This can happen for a variety of reasons, from benign and temporary problems to chronic or autoimmune conditions. Most are not serious, but some require medical attention to confirm the diagnosis and rule out complications.
Main causes of white spots on the skin
Here are the most frequent ones, ordered from highest to lowest prevalence according to age and skin type:
- Idiopathic guttate hypomelanosis (sun spots or “white spots”)
is very common after age 40-50, especially in people with fair skin.
They are small, round, white spots (2-6 mm) on the arms, legs, back, and hands.
Causes: cumulative sun exposure over the years + natural aging (melanocytes stop functioning in exposed areas).
They are not itchy or painful; they are harmless but irreversible. - Pityriasis versicolor (or tinea versicolor)
is a fungal infection caused by fungi of the genus Malassezia (normal on the skin, but which overgrow in heat, sweat, and humidity).
It causes white, pink, or light brown patches on the chest, back, neck, and arms.
It is more visible after sun exposure (the fungus blocks even pigmentation).
It is usually mildly itchy or scaly. - Pityriasis alba
is a mild form of atopic dermatitis (eczema). It
presents as dry, scaly, round or oval white patches, primarily on the face (cheeks), neck, and arms. It
is very common in children and adolescents, but can also occur in adults with atopic dermatitis.
It is associated with dry skin, sun exposure, and a history of allergies. - Vitiligo is
an autoimmune disease in which the immune system attacks and destroys melanocytes. It presents
as well-defined, symmetrical white patches that may grow or merge.
It frequently begins on the hands, face, elbows, knees, or genitals.
It can appear at any age, but usually begins before age 30-40 (although there are late-onset cases). - Post-inflammatory hypopigmentation occurs
after injuries or inflammation such as acne, burns, eczema, psoriasis, wounds, or dermatitis.
The healthy skin in these areas is lighter due to temporary damage to melanocytes.
It usually improves on its own with time and sun protection.Other less frequent causes:Recent Articles
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