as I am sure you know, unless you are in a safe and committed relationship, it is important not to have unprotected sex. however, lumps like you describe are usually not std's. most of the time, a lump on the lip of the vagina is a result of a small gland in the skin getting clogged and causing a small lump. they can often resolve with warm soaks several times a day. other possibilities include a small lump of fat called a lipoma, or an inclusion cyst or an ingrown hair. none of these are dangerous and they generally resolve on their own. however, if it persists or grows bigger or becomes painful, you should see your doctor.

as far as the periods are concerned, it is not normal to have two periods a months like you describe. most likely, if you bleed that often, then you are probably not ovulating with each cycle so you have an unusual pattern of bleeding. since that is the case, it is expected that this pattern will not be consistent, and sometimes you may miss an episode of bleeding, while other times you may bleed more often. to treat this, you should talk to your doctor to discuss figuring out why your periods are not normal, and ten decide the best way to treat it. there are many many reasons why this could be happening, and of you would like to talk further about the possibilities, please feel free to let me know and I would be happy to help. I hope this answers your question. good luck!