Formation of milia following abrasive treatment for postacne scarring.

Abstract

Postacne scarring has been treated lately by mechanical abrasion of the affected areas either with sandpaper or with revolving metallic brushes. The purpose of the treatment is to lower the level of the skin to the base of the scar, resulting in a smoother surface. The treatment is very effective in most cases. We have, however, observed an unexpected sequela in a number of patients treated with a revolving metal brush, namely, the formation of many milia on the treated areas. This did not occur after the first treatment in any patient. However, in about 25% of the patients treated more than once, milia formed about two months after the second or third treatment. They were removed in the usual manner. There are two possibilities to account for the formation of milia in these patients: (1) Some follicles are closed by the abrasive action of the brush, or/and (2) small