How safe are silicone lubes?

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I read that for anal silicone is better. But I read that the silicone stays ON the skin and cannot be washed off. I also read that silicone in cosmetics is bad for the skin cause it clogs the pores. If silicone is bad for the face then why should it be safe in the rectum? What if this stuff creates an impermeable layer upon the membrane which you cannot get rid off anymore? Or what if it causes you to get uncontrollable diarrhea because the rectum is totally slippery on the inside?

The rectum is meant to be slippery on the inside anyway. I think silicone oil would be all right--it would just pass through the body. Silicone grease I am less sure about. It is indeed difficult, though not impossible, to wash off completely.