What Is Pityriasis Alba?
Apr 14, 2021
Source: Cainiu Health
Dr. Liu Wan
Introduction
Pityriasis alba, also known as simple pityriasis or parasitic hypopigmented macules—and commonly referred to as “peach blossom tinea”—is termed “worm spot” or “wind tinea” in Traditional Chinese Medicine. It manifests as white, bran-like scaly patches on the face, adversely affecting facial aesthetics. The lesions primarily appear as hypopigmented, round or oval macules, most frequently occurring on the face but also commonly affecting the upper arms, neck, and shoulders. Most patients are asymptomatic; however, some may experience mild pruritus.
Pityriasis alba is a relatively common condition among preschool-aged children and adolescents, particularly affecting those with dry skin or darker skin tones. Fundamentally, pityriasis alba is a mild form of dermatitis—specifically, a constitutional (inherent) type of eczematous dermatitis—and occurs more frequently in individuals with an atopic (allergic) predisposition. Many people remain unfamiliar with this condition; today, we address this topic to provide clarification.
What Is Pityriasis Alba?
Pityriasis alba, also known as simple pityriasis or tinea versicolor-like hypopigmented macules, is colloquially referred to as “peach blossom rash.” In Traditional Chinese Medicine (TCM), it is termed “worm spots” or “wind rash.” Clinically, it manifests as whitish, scaly, flaky patches on the face, potentially compromising facial aesthetics. This condition typically begins in spring and resolves spontaneously by late summer or autumn. Lesions appear as hypopigmented, round or oval macules or patches, most commonly on the face but also frequently involving the upper arms, neck, and shoulders. Patch size varies, ranging from approximately 1 cm to several centimeters in diameter; they are pale white or light red, well-demarcated, with slightly raised borders and covered by fine scales. Most patients are asymptomatic, though some may experience mild pruritus. Lesions usually resolve spontaneously within days or over a longer period. The exact etiology remains unclear. Some researchers have suggested an association with streptococcal infection; however, recent evidence points toward pityriasis alba being a nonspecific dermatitis or a subtype of eczema, possibly linked to intense sun exposure. A significant proportion of cases appear associated with intestinal parasitic infestation. Other contributing external factors may include skin dryness and excessive sun exposure. The condition most commonly affects children aged three years (preschool age) through adolescence.
Knowledge Extension: How to Prevent Pityriasis Alba
1. Ensure adequate intake of trace elements; copper-containing utensils are recommended.
2. Consume ample fresh, light-colored leafy greens rich in chlorophyll, as well as foods such as pork liver, lean beef, lean pork, and dark-colored foods like black sesame seeds and black beans.
3. Limit intake of spicy or irritating foods, including alcohol, chili peppers, and raw garlic.
4. Reduce consumption of lamb, fatty meats, and seafood.
5. Minimize intake of vitamin C–rich foods (e.g., tomatoes, hawthorn berries, wax jambu) and carbonated beverages.
The above provides an overview of pityriasis alba. We hope this information proves helpful.
