Blisters/Calluses and Caisson Disease

This policy has not been amended to reflect the
Workplace Safety and Insurance Act and Regulations made under it


If workers are or have been employed in a process described in column 2 of Schedule 3 and contract the medical condition listed opposite in column 1, the Board accepts the condition as work-related.


Blisters and Calluses

Blisters are listed in Schedule 3 of the Act as an occupational disease caused by “Any process involving continuous friction.” If workers sustain blisters or calluses - from a work process - that require medical attention, their injuries are work-related. Whether workers wear or do not wear special clothing (e.g., safety boots or gloves) is not relevant.

Caisson disease "the bends"

Caisson disease (an occupational disease listed in Schedule 3 of the Act) occurs when workers are subjected to rapid reduction of air pressure following exposure to compressed air (e.g., while working in compressed air tunnels or while diving). Workers with a confirmed diagnosis of caisson disease are entitled to benefits. Decision-makers confirm

  • that the worker was working in compressed air conditions
  • the level of atmospheric pressure
  • the time spent in compressed air
  • the type and condition of the jobsite decompression chamber that was used, and
  • any other claim-related information.


Legislative Authority

Workers’ Compensation Act, R.S.O. 1990
Sections 1, 134 and Schedule 3