As others said, It is likely that the Lot of TPE used for the Sex Doll has lost some of his ingredients and can cause early aging. But I think you will notice that other areas too, like the armpits behind the knees, are consumed. It seems that it is limited to private use, So it comes to mind that the chemicals that are used to clean are the culprits.

Vaseline/mineral oil in itself is a bad promoter of bacterial growth, Then just mix some light soap in water immediately after use and wash it from time to time to prevent the risk of mold. I think people will continue to read the horror stories here, to see the arguments passed, to be frightened and then sometimes to reorder. Be scrupulous, but not necessarily with the use of chemicals and hot water.

Just to give you some ideas on where to start fixing the work that has been done. It is necessary to get a sample / TPE spare of the manufacturer of the Inflatable doll piper, apparently with the same shade of skin. You want to use the tools. Therefore, As Arthur said, It is a hot air relaxation station. Furthermore, You can get a stainless steel sculpting kit like this, which allows you to add the filling of artificial intelligence inflatable doll and to smooth the area.