Post by justasking on Feb 23, 2018 20:04:53 GMT
So it seems that at least on one occasion he had calluses on his thumb only, and on another occasion he had calluses around the proximal digital area (?) at the top of the palm / at the base of the fingers + the entire length of the thumb.
Some activities have been suggested as the cause of calluses on thumb only (bowling), and some activities have been suggested as the cause of developing calluses on that particular wider area as well (tennis).
The activities resulting in calluses on thumb only wouldn't by definition account for having calluses on that wider area. So having calluses on thumb only is either a separate occurrence, or the causative factor wasn't something that would peculiarly result in calluses on thumb only, meaning that he just happened to have them only on his thumb on that occasion.
If we assume these calluses resulted from the same activity, the question is: what activities would explain having calluses unevenly at times on thumb only, and at other times at the base of the fingers and at the entire length of the thumb? If we take tennis, for example, as an acitivity usually resulting in calluses on that wider area - could it still account for having calluses strictly on thumb (and nowhere else) at times?
Couple of possibilities:
A) Two separate activities resulting in calluses with differing patterns
B) One activity potentially resulting in calluses with differing patterns on separate occasions
Additional option would be two separate activities having something to do with each other as different elements of some greater activity.
The calluses might have resulted from him using a wrench, crowbar, whatever tool it was that he used for prying.