cant say cause Im not your gynocologist and havent looked up there but it could be something as simple as it being your normal secretions that are dried out and sticking way up inside because of certain times during the cycle the vagina becomes very dry, or very dry normal secretions stuck up there from dehydration, it could be left over stuff from your last play date with your significant other, or it could be an allegic reaction to lotions soaps, laundry detergents, wearing the same under garment more than once, or if you use any "toys or objects" some bacteria could have stayed up there. could be the last play date got a bit too rough for the insides, gosh it could be almost anything. the only way to know for sure when it comes to internal problems like this is to see your gynocologist or your physician for an exam.