What the ๐Ÿคฌ are these? Stretch marks? Something else? Doctor?

My husband kept telling me I have bruises on my butt. I finally asked him to take a picture (our dog broke our only full length mirror). This is what he sends me?! ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ๐Ÿ˜ฎ Iโ€™m a little concerned.. these donโ€™t look like normal stretch marks but I have no clue what they could be! Should I go to be doctor?