Cheraghlou S, et al. - Researchers conducted this cross-sectional study to determine the geographical variation in the availability of photodynamic therapy (PDT), used in dermatology as “field therapy” for diffuse premalignant actinic keratoses and as a treatment for superficial nonmelanoma skin cancers (NMSCs), for the Medicare population in the United States and to identify the temporal patterns in PDT costs and use from 2012 to 2017. PDT can be a useful strategy in response to the growing occurrence of NMSCs, particularly for the Medicare population, where NMSC treatment is a major expense. However, there are challenges related to the use of PDT, including the need for incubation time with the photosensitizer. This may be the most important problem in rural areas where patients may live far away from the nearest dermatologist. Work studying other specialized dermatological treatments suggests that rural patients have limited access to certain treatments.