Does pityriasis alba spread?
Apr 07, 2023
Source: Cainiu Health
Dr. Liu Wan
Introduction
Pityriasis alba usually spreads, but the progression is slow and poses little harm. After 1–2 weeks, it turns into slightly hypopigmented patches covered with dry, fine, scaly white flakes. As children grow older, particularly after the age of 12–13, the condition gradually stabilizes; at this point, the white patches stop spreading and slowly fade away.
Pityriasis alba usually spreads, but the progression is slow and it is not significantly harmful.
Pityriasis alba, also known as simple pityriasis, is mostly characterized by hypopigmented patches that may merge together and sometimes exhibit mild scaling. Common causes include sun exposure, unbalanced diet, and intestinal parasitic infections. It primarily affects the faces of children and adolescents. Initially, lesions appear as round, oval, or irregularly shaped faint red or skin-colored patches with ill-defined borders, ranging from 0.5 to 2 cm in size, and have a fine, bran-like scale on the surface. After 1–2 weeks, they evolve into slightly hypopigmented areas covered with dry, fine, white, bran-like scales. After the age of 12–13, as the child grows older, the condition tends to stabilize; at this stage, the white patches stop spreading and gradually fade away.
Under a doctor's guidance, patients may take vitamin B supplements or use topical agents such as diphenhydramine, silicone oil, or vitamin E to moisturize the skin. In daily life, maintaining skin hydration and sun protection are important. The condition typically resolves spontaneously, so specific treatment is generally unnecessary.
