Pityriasis amiantacea is a condition in which there is excessive scaling of the scalp. Thick silvery or yellowish scales encircle the hair shafts and may bind down tufts of hair.
The rash usually lasts one to three months in approximately 80 percent of cases. Pityriasis rosea eventually goes away on its own, even without treatment, and usually does not leave any scars or permanent marks.
Pityriasis amiantacea (PA) is a rare inflammatory condition of the scalp associated with underlying disease processes such as atopic dermatitis, psoriasis, tinea capitis, and seborrheic dermatitis. Recent literature has also found an association with Staphylococcus aureus contributing to the pathogenesis.