Does anyone know what cause this to happen.
She is less that 3 years old…
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I’ve never seen damage like that.
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I’m sorry about your doll, I don’t know how to help, but maybe we could explore how this occurred so that you don’t have this problem in the future.
Silicone Si-O bonds require a higher frequency of light than UV to break but since I don’t know what it in these polymer mixes, I can’t provide any concrete answers. But surface UV can break down or polymerize some of the oils that are used in the manufacturing process of silicone mixtures.
But I’ve never seen that sort of pitting wear on anything made of silicones- so I suspect it’s a tpe doll.
TPE is effectively a blend of polymers or plastics- a soft polymer and a harder polymer that are miscible enough, warmed and injection molded before setting.
The issue with polymers and longevity is that carbon-carbon bonds and especially pi bonds electrons can absorb UV spectrum light to elevate potential which could then twist the molecule or to be used to break or form other cross linking bonds to nearby molecules like other polymers or oxygen and water in the air- particularly if there is heat, mechanical, or electropolarizing stresses (like a base or acid).
Unfortunately, I don’t know much about what exactly tpe or the silicon polymers used in doll manufacturing are- so my chemistry knowledge is conjecture. And I also didn’t study plastics, instead focusing on transition metals.
Please answer the following;
Was it stored in a way where light would have been exposed to that area?
Is there a film over the window?
Do you clean it with peroxide or use an ozone generator in the house?
What do you clean it with?
Do you use alcohol on the doll?
Did you keep the surface oiled?
My suspicion is that this is a tpe doll that was stored where an errant beam of light- maybe something reflected off a ray from a window was reflected onto those areas and caused a chemical rearrangement through a radical reaction where some polymers twisted and reacted to either water or oxygen under the mechanical stress and contracted (condensing) near the surface.
So either heat or UV mediated oxidation broke the surface but it doesn’t make sense for heat though since dolls are meant to be compressed and released. My bet is on light if there is no chemical catalyst…
Im guessing that a sample from the damaged surface would have a different IR spectra reading than the non damaged area with the formation of aldehydes and carboxylic acid groups at the surface as carbon-carbon bonds were reterminated with water or oxygen.
Hope something helps. I’m sorry about the doll dude 
Please answer the following;
Was it stored in a way where light would have been exposed to that area?
NO
Is there a film over the window?
NO
Do you clean it with peroxide or use an ozone generator in the house?
NO
What do you clean it with?
Antibiotic soap @ water with a sponge
Do you use alcohol on the doll?
NO
Did you keep the surface oiled?
NO
FYI, no other areas on the doll have that and neither does my other doll which I have had 18months longer than this one…