Pityriasis alba: information for patients

Pityriasis alba is a common cause of light-colored patches on the skin, especially in children and adolescents. It is usually benign, non-contagious, and in many cases, it improves gradually. The key is recognizing when the appearance is consistent with pityriasis alba and when it is necessary to rule out other causes of white or hypopigmented patches.

Summary in 60 seconds

• Pityriasis alba usually appears as patches lighter than the surrounding skin , with poorly defined borders and sometimes fine scaling.
• It is more common in children and adolescents , although it can be seen at other ages.
• It frequently appears on the face , especially the cheeks and chin; it can also be seen on the neck, shoulders, arms, or upper torso.
• It is not an infection and it is not contagious .
• It is associated with dry skin, atopic tendencies, and mild forms of eczema-like skin inflammation, although the exact cause is not fully defined.
• It may be more noticeable after sun exposure because the surrounding skin tans, but the spot does not tan at the same rate.
• The treatment usually focuses on hydration, gentle cleansing, and photoprotection.
• Mild corticosteroids or calcineurin inhibitors may be indicated in some cases, but they should always be used with medical advice and monitoring, especially on the face.
• Check if the spots grow quickly, are very white and well-defined, itch a lot, hurt, become infected, or do not fit the usual pattern.
• Most cases improve over time, although color recovery can take months.

The British Association of Dermatologists describes pityriasis alba as a common condition in children and young adults, with paler areas that may become more visible after sun exposure; DermNet also presents it as a form of low-grade dermatitis/eczema, common in childhood (BAD 2025 ; DermNet 2020).

What is pityriasis alba?

Pityriasis alba is a skin condition characterized by areas of hypopigmented skin, meaning skin that is lighter than the usual skin tone. The term «pityriasis» refers to the fine scaling, and «alba» to the light or whitish color.

It is not usually a dangerous disease or a sign of internal damage. In practical terms, it is interpreted as a mild form of skin inflammation that leaves lighter pigmentation for a while. The skin is not «completely depigmented» as in some forms of vitiligo; it often retains some pigment, and the borders are less sharp.

Pityriasis alba primarily affects children between the ages of 3 and 16, although it can occur outside this range. It may be more noticeable in dark, black, or tanned skin due to the contrast, not necessarily because it is more severe. (Givler 2024 ; MedlinePlus 2025)

Why does it appear?

The exact cause is not fully established. Available evidence suggests that pityriasis alba is associated with mild skin inflammation, dry skin, and, in some people, a history of atopic dermatitis or eczema. However, it can also occur in people with no prior diagnosis of eczema.

In many cases, the skin experienced subtle inflammation that went unnoticed: a somewhat dry, rough, or slightly reddish area that later leaves a lighter patch. This is why it’s considered a form of post-inflammatory hypopigmentation .

The sun is not usually the sole cause, but it can make dark spots more noticeable. The surrounding healthy skin tans; the affected area, on the other hand, develops less pigmentation and becomes more visible. This explains why many families consult a doctor in the summer or after vacations.

It should not be automatically assumed that pityriasis alba is due to “vitamin deficiency,” parasites, fungi, or anemia. Some research has explored associations with micronutrients or other factors, but clinical reviews do not consider these a universal explanation or a reason for self-medication. Miazek 2015 ; DermNet 2020

What does it look like and what symptoms does it cause?

Pityriasis alba usually appears as one or more spots:

• lighter than the surrounding skin;
• round, oval or irregular;
• with poorly defined edges;
• with fine flaking or dry texture;
• with mild itching or without itching;
• frequently located on cheeks, chin, neck, shoulders, arms or upper torso.

Initially, there may be a slightly pinkish or reddish, somewhat dry patch. Over time, this area becomes lighter. Later, the scaling may decrease, leaving only the color difference.

An important clinical clue is the border: in pityriasis alba, it is usually smooth and diffuse . In vitiligo, on the other hand, the patches are usually whiter, sharper, better defined, and show greater pigment loss. Even so, it is not always possible to differentiate them with certainty from a photograph; when in doubt, a specialist medical evaluation is advisable.

DermNet describes classic lesions ranging from 0.5 to 5 cm, with generally poorly defined borders, minimal or no itching, and increased visibility of hypopigmentation in summer. DermNet 2020

What can you do today?

The goal is not to aggressively «cover up» the blemish, but to help the skin recover its barrier, reduce dryness, and prevent the contrast from increasing.

1. Moisturize your skin every day.
Use a simple, fragrance-free moisturizer suitable for sensitive skin. In children, it can be applied once or twice a day; if there is significant dryness, a doctor may recommend more frequent application.

2. Switch to gentle cleaning.
Avoid heavily perfumed soaps, exfoliants, abrasive sponges, and very hot baths. Skin with pityriasis alba benefits from a simple routine: brief cleansing, lukewarm water, and moisturizing after bathing.

3. Use sunscreen.
Sunscreen won’t «cure» the dark spot, but it helps prevent the surrounding skin from tanning too much and reduces the risk of sunburn in lighter areas. For children and those with sensitive skin, it’s best to choose broad-spectrum formulas and reapply as needed.

4. Do not self-medicate powerful corticosteroids.
If there is significant redness, itching, or scaling, a healthcare professional may recommend a short course of mild topical corticosteroid, such as hydrocortisone, especially if there is an eczema component. Corticosteroids should be used with caution on the face.

5. Ask if you want to accelerate your aesthetic recovery.
In persistent or visible cases, the dermatologist may consider prescription treatments, such as calcineurin inhibitors—for example, tacrolimus or pimecrolimus—especially when the goal is to avoid corticosteroids in sensitive areas. These treatments are not necessary for all patients.

Clinical sources agree that many forms do not require specific treatment; when dryness, itching, or inflammation is present, moisturizers, mild corticosteroids for short periods, or corticosteroid-sparing therapies can be used under medical supervision. BAD 2025 ; PCDS 2022 ; Givler 2024

What NOT to do?

• Do not rub the stain hard. Friction can further irritate the skin and prolong the color difference.
• Do not use lemon, baking soda, alcohol, toothpaste, «whitening» remedies, or homemade mixtures. They can cause irritant dermatitis, burns, or uneven pigmentation.
• Do not apply depigmenting creams. Pityriasis alba is not treated by further lightening the skin; the goal is to normalize the skin barrier and reduce inflammation.
• Don’t use antifungals routinely. Some light-colored patches can be caused by fungi, such as tinea versicolor, but tinea alba is not a fungal infection. If there’s any doubt, your doctor can perform a KOH test or a skin scraping.
• Don’t stop using sun protection because you think «the sun evens out the color.» In reality, the sun can increase the contrast and make the lesion more noticeable.

Don’t assume that every white patch on a child is pityriasis alba. Other possible diagnoses include vitiligo, tinea, post-inflammatory hypopigmentation from other causes, depigmented nevus, and, in specific contexts, less common diseases.

When should I consult?

Consult a dermatology specialist if any of these situations appear:

• very white spots, with very defined edges or that progress rapidly;
• involvement around the eyes, mouth, hands, genitals, or multiple new areas;
• intense itching, pain, burning, scabs, discharge, bleeding or fever;
• ring-shaped lesions, with a lot of scaling, suggestive of fungus;
• loss of sensitivity in the spot;
• spots present from birth or that follow a very segmented pattern;
• worsening despite gentle care for several weeks;
• significant emotional impact, shame, anxiety or school bullying;
• diagnostic uncertainty between pityriasis alba, vitiligo or another cause of hypopigmentation.

Most cases are not urgent, but a proper evaluation avoids unnecessary treatments and allows for the recognition of diagnoses that do require specific management.

What does a dermatologist usually do?

The dermatologist usually begins with a brief medical history: age, duration of symptoms, recent changes, sun exposure, history of dry skin, atopic dermatitis, allergies, products used, and previous treatments. Then they observe the distribution, color, borders, and texture of the patches. In many cases, this is enough to guide the diagnosis.

If you have any doubts, you can use additional tools:

• Dermatoscopy: allows visualization of pigment details, scaling, and borders. In pityriasis alba, poorly defined whitish areas, fine scaling, and a faint pigment network are typically observed.
• Wood’s lamp: helps differentiate some causes of light-colored patches. In pityriasis alba, the patch may be more visible, but it doesn’t usually have the bright fluorescence or sharp borders typical of other conditions like vitiligo.
• KOH scraping: used when you want to rule out fungal infection.
• Skin biopsy: rarely necessary. It is reserved for atypical, persistent, extensive cases or when another disease is suspected.

In general, the diagnosis is usually clinical; tests such as Wood’s lamp examination, mycological scraping, or biopsy are reserved for cases with diagnostic uncertainty. DermNet 2020 ; Givler 2024

Frequently Asked Questions

Is pityriasis alba contagious?

• No. Pityriasis alba is not contagious. It is not transmitted through contact, towels, swimming pools, school, or family life. The British Association of Dermatologists describes it as a non-contagious and non-hereditary condition.

Is it the same as vitiligo?

• No. In pityriasis alba, the patches are usually milder, less white, and have poorly defined borders. In vitiligo, there is usually a more marked loss of pigment, more defined borders, and certain typical locations. Even so, if the patch is very white, grows rapidly, or is cause for concern, it’s advisable to consult a doctor.

How long does it take to come off?

• It can take months. Many injuries improve within the first year, although some may persist longer or recur. The recovery is usually gradual; if it doesn’t disappear in a few days, it doesn’t necessarily mean it’s serious.

Does it leave a scar?

• It usually doesn’t leave a scar. The skin tends to gradually regain its color. The risk of scarring increases if it becomes irritated, scratched vigorously, infected, or if harsh products are applied.

Can I use hydrocortisone?

• It can be helpful for itching, redness, or peeling, but on the face and in children, it should only be used for short periods and always under professional guidance. It’s not advisable to apply potent corticosteroids or repeat courses of treatment without a clear diagnosis.

Do vitamins work?

• These should not be used as a standard treatment. If nutritional deficiencies, restrictive diets, weight loss, anemia, or other symptoms are suspected, further testing may be ordered. For most typical cases, skin barrier care and sun protection are more important.

Does the sun help with repigmentation?

• This is not the recommended strategy. Sun exposure can increase the contrast because the surrounding skin tans more than the dark spot. Furthermore, lighter areas can burn more easily. Sun protection is a prudent measure.

Bibliography and sources

• Givler DN, Saleh HM. Pityriasis Alba . In: StatPearls [Internet] . Treasure Island (FL): StatPearls Publishing; 2024 Jan 25 [cited 2026 Jul 1] . Available at: https://www.ncbi.nlm.nih.gov/books/NBK431061/
• Oakley A. Pityriasis alba . DermNet NZ [Internet] . Updated 2016 Jan; revised 2020 Sep [cited 2026 Jul 1] . Available at: https://dermnetnz.org/topics/pityriasis-alba
• British Association of Dermatologists. Pityriasis alba . Patient Information Sheetlet [Internet] . London: British Association of Dermatologists; 2025 Mar [cited 2026 Jul 1] . Available at: https://www.bad.org.uk/pils/pityriasis-alba
• Primary Care Dermatology Society. Pityriasis alba . Clinical guidance [Internet] . 2022 May 28 [cited 2026 Jul 1] .Available at: https://www.pcds.org.uk/clinical-guidance/pityriasis-alba
• MedlinePlus. Pityriasis alba . Medical Encyclopedia [Internet] . Bethesda (MD): National Library of Medicine; reviewed 2025 Apr 1 [cited 2026 Jul 1] . Available at: https://medlineplus.gov/spanish/ency/article/001463.htm
• Miazek N, Michalek I, Pawlowska-Kisiel M, Olszewska M, Rudnicka L. Pityriasis alba—common disease, enigmatic entity: up-to-date review of the literature . Pediatr Dermatol. 2015 Nov-Dec;32(6):786-791. doi:10.1111/pde.12683. Available at: https://pubmed.ncbi.nlm.nih.gov/26477326/
• Moreno-Cruz B, Torres-Álvarez B, Hernández-Blanco D, Castanedo-Cazares JP. Double-blind, placebo-controlled, randomized study comparing 0.0003% calcitriol with 0.1% tacrolimus ointments for the treatment of endemic pityriasis alba . Dermatol Res Pract. 2012;2012:303275. doi:10.1155/2012/303275. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC3346967/
• Rigopoulos D, Gregoriou S, Charissi C, Kontochristopoulos G, Kalogeromitros D, Georgala S. Tacrolimus ointment 0.1% in pityriasis alba: an open-label, randomized, placebo-controlled study . Br J Dermatol. 2006 Jul;155(1):152-155. doi:10.1111/j.1365-2133.2006.07181.x. Available at: https://pubmed.ncbi.nlm.nih.gov/16792767/
• Fujita WH, McCormick CL, Parneix-Spake A. An exploratory study to evaluate the efficacy of pimecrolimus cream 1% for the treatment of pityriasis alba . Int J Dermatol. 2007 Jul;46(7):700-705. doi:10.1111/j.1365-4632.2007.03145.x. Available at: https://pubmed.ncbi.nlm.nih.gov/17614797/
• Al-Refu K. Dermoscopy is a new diagnostic tool in diagnosis of common hypopigmented macular disease: a descriptive study . Dermatol Reports. 2019 Jan 23;11(1):7916. doi:10.4081/dr.2018.7916. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6509478/
• Cleveland Clinic. Pityriasis Alba: Symptoms, Causes & Treatment . Health Library [Internet] . Updated 2024 Dec 18 [cited 2026 Jul 1] . Available at: https://my.clevelandclinic.org/health/diseases/pityriasis-alba