Since you're allergic to latex, the only other prosthetic alternative you have is silicone gel-filled appliances.  That process is highly specialized, quite expensive but can accomplish incredible results.  The product is made translucent so natural skin tones can show through, it can be flesh colored and made to look, feel and move like real skin.  It's HOT to wear, NOT uncomfortable though, but the results can be stunningly good.  It can be applied with silicone adhesives (actually the silicone product itself is used as the adhesive - equal parts A and B) and will easily stay on for hours.  Removal is EASY - simply catch an edge and gently pull off.  Leaves no adhesive residue to clean up and only clean up is whatever makeup used to blend edges.  But again, this is a highly specialized process that only qualified makeup artists can accomplish.  And doing a FAT makeup without prosthetics especially if the difference is drastically different with the weight, well it just won't work as far as I'm concerned.  But this is one of two alternatives.  The OTHER alternative is using gelatin prosthetic appliances.  The problem with gelatin is that it's susceptible to heat, sweat and other atmospheric conditions and it breaks down easily if proper preparation is not done.  It requires a fairly harsh adhesive to make it stay on (works well enough though with Spirit Gum) but would be better if you used a medical grade prosthetic adhesive.  THEN removal is much more tedious and involved.

 

Good luck - keep us informed.

 

TonyDi