Custom Skins

Hello...i'm wondering if using a program that changes skins is allowed or not,i searched on other forums and somebody says that is allowed somebody says that is isn't.I saw that riot said about this program (i'm not gonna say the name unless somebody from the riot team asks me) that is allowed.I understand that using the official skins would be penalized but what about the custom skins? I just don't want to risk and if somebody from the support team would answer this would be great.
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