Avoid touching thermal paper cash register receipts, as they contain BPA which can be absorbed through the skin, especially if you have used hand sanitizer or lotion just before.

noli's read

BPA (Bisphenol A) is indeed used as a developer in many types of thermal paper, and studies confirm that cutaneous transfer is possible during handling. Research, including observational and experimental studies (e.g., Environmental Health Perspectives), has demonstrated that the use of products such as hand sanitizer or sunscreens drastically increases skin permeability, thereby facilitating the absorption of BPA. It is established that workers exposed on a daily basis show higher levels of BPA in their bodies. However, for the occasional consumer, the actual health risk remains debated and difficult to quantify in comparison to other sources of environmental exposure. While the transfer mechanism is scientifically valid, the direct clinical impact of occasional handling has not yet been definitively settled. The claim is therefore based on real biochemical facts, although the magnitude of the individual danger is sometimes perceived in an alarmist manner.

the sources

1. 1Gore AC, Chappell VA, Fenton SE, et al. 2015