according to your description the possibilities are,
cyst: bartholin glands lies near the opening of vagina, when the duct of the cyst gets blocked it will form cyst when that get infected there is possibility of abscess
-gartner's cyst is one more possibility which also can occur in the inner side of vagina,
when there is minimal abrasions on the wall of cyst possibly some spotting can be seen,
so possibly in your appointment the actual nature of the lesion can be found out and treatment can be taken.