Just to help you gauge the size of these things, here's a
Video of Someone having TWO of them removed from their back.
They use Duct tape over the opening in an attempt to partially suffocate the larvae for two reasons. 1. It draws them nearer to the surface as they try to breathe. (Petrolium jelly could also work). and 2. When partially suffocated, the larvae is more docile and less likely to use its Spines to anchor itself in. Thus rendering it virtually impossible to remove without making a mess of you, or leaving some of it behind.
Note how , on about 25 seconds , the smaller / lower one tries to sink back in. :edbarf:
Mexico is a bad idea. Skegness is safer. :wink: