A number of owners of the LG G Watch have noticed that the gold contacts on the back where the watch attaches to the charger have been causing skin irritation. LG has now reportedly begun to roll out an OTA fix to address the problem; the software on the watch will go from KMV78V to KMV78Y.
It sounds odd for an OTA update to fix an issue causing skin irritation, but it can. The irritation comes from the result of galvanic corrosion caused when sweat mixes with a running electrical current between two metals.
The update is designed to disable the current when the G Watch isn't in the charging dock. The update should stop this irritation and eliminate any issues for many users. The OTA update won't help those with pins that are corroded.