Photo: Diego Uchitel
To eliminate discoloration on the arms, many doctors use photodynamic therapy (PDT), which treats both the aesthetic issue and the precancerous lesions that can appear in this area. The arms are painted with a photosensitizing chemical that's activated with light, leaving the skin red, swollen, and a little sore for up to four days. After a week, it's brighter and much more even-toned; one or two sessions usually suffice. To address both discoloration and crepiness, a fractionated nonablative laser is a popular choice; three to five treatments do the trick.