I was never able to find any way to stop or cure the spot on the legs of the workout skippers. However. I was able to "fix" the issue and I will share this information with you all.
I took my two workout skippers one with orange spots and one with white spots. I took two skippers that were created a bit later then workout skipper. I took glitter jewel skipper and sunsensation skipper. I heated the heads with a hairdryer on hot. I was able to gently pop the heads off the two doll and by heating also the heads on the working out skippers to transplant the heads on to the bodies that did not have spot. It was a not so nice way to do it. I would of liked to not had to ruin two perfectly good dolls. But, I had already collected all those dolls from the 90s, so I had them on hand and they don't really sell on ebay very well. This is the only way to stop the problem. The legs on workout skipper never did become sticky even with the spots. Spots is a different issue from sticky leg. But, I felt weird about keeping those dolls with the spots as I worry that plastic decay and the implications of it. It was at the do or die point. I had to either give up and discard the dolls or I had to make a bold move. I am happy with the way it turned out. When I say, they never did get sticky, they may have been tad sticky, but not super sticky to the point that you can really say in its so sticky when you touch it. I have other dolls that I touch them and I wonder if the legs are beginning to become sticky, but I don't have a clear idea. I don't own the older sorts of dolls that have the problem. I collect later barbies. At first, I thougth sticky legs and leg spots were part of the same issue.