Pityriasis Alba: Managing Pale Skin Patches in the UK

Pityriasis alba is a common, non-contagious skin disorder primarily affecting children and adolescents between the ages of 3 and 16. It is characterised by the appearance of round or oval patches that look lighter than the surrounding skin. The term 'pityriasis' refers to the fine, scale-like quality of the skin, while 'alba' is Latin for white.

In the UK, many parents notice these patches during the summer. This isn't because the sun causes the condition, but because the sun tans the surrounding healthy skin, making the lighter, non-tanning patches much more obvious. Although it can cause concern for parents, Pityriasis alba is not harmful, not infectious, and typically resolves without leaving permanent marks.

The condition usually follows a predictable pattern. It often starts as slightly scaly, pinkish patches that may be itchy. Most patients, however, do not notice this initial stage and only seek advice when the patches become pale (hypopigmented).

• Location: Patches are most commonly found on the face, particularly the cheeks and chin. They can also appear on the neck, shoulders, and upper arms.
• Appearance: Round or oval patches, usually 1cm to 4cm in diameter.
• Texture: The skin may feel slightly dry or have very fine, powdery scales.
• Duration: Patches can last for several months, sometimes coming and going for a year or more before fully resolving.

The exact cause of pityriasis alba remains unknown, but dermatologists and the NHS generally categorise it as a mild form of atopic dermatitis (eczema). It is frequently seen in individuals who have a history of dry skin, hay fever, or asthma.

The paleness occurs because the inflammatory process in the skin interferes with the activity of melanocytes—the cells responsible for producing skin pigment. Unlike vitiligo, where the pigment-producing cells are destroyed, in pityriasis alba, they are simply less active for a period of time. Factors that can worsen the appearance include cold dry air, harsh soaps, and unprotected sun exposure.

It is important to distinguish these pale patches from other skin conditions that may require different treatments:

Vitiligo

Vitiligo usually results in 'chalk-white' patches with very sharp borders. Unlike pityriasis alba, vitiligo patches have no scale and can appear anywhere on the body, including the hands and around the eyes.

Tinea Versicolor (Fungal Infection)

Fungal infections often produce patches on the back and chest rather than the face. A GP can usually tell the difference by looking at the distribution and the type of scale present.

Pityriasis Rosea

While similar in name, this condition usually starts with a single large 'herald patch' followed by a 'Christmas tree' pattern of smaller spots across the torso.

Because pityriasis alba is self-limiting, intensive treatment is rarely necessary. However, several steps can help improve the skin's appearance and comfort:

• Emollients: Regular use of fragrance-free moisturisers or aqueous creams helps reduce dryness and scaling. Applying these after a bath is most effective.
• Sun Protection: Using a high-factor sunscreen (SPF 30 or 50) is vital. While the sun doesn't cause the condition, tanning the rest of the skin makes the patches stand out. Sunscreen also prevents the affected areas from burning, as they lack protective pigment.
• Mild Steroid Creams: In cases where the patches are red or itchy, a low-potency hydrocortisone cream may be prescribed for a short period to reduce inflammation.
• Avoid Irritants: Switch to soap-free cleansers and avoid hot showers, which can strip the skin of natural oils.

If you are unsure whether a skin patch is pityriasis alba or something else, you should speak to a GP online. An online consultation allows you to share clear photographs or video of the skin for a professional assessment from the comfort of your home.

You should consult a doctor if:

• The patches are spreading rapidly or covering large areas of the body.
• The skin is very itchy, painful, or shows signs of infection (such as oozing or crusting).
• You are worried about vitiligo or a fungal infection.
• The patches do not improve with regular moisturising.

A GP can provide a diagnosis and, if necessary, issue a prescription for mild medicated creams or refer you to a dermatologist if the diagnosis is unclear.