I have a burning sensation and irritation in vagina and sometime back little blood also came from urine ..eventually it vanished but irritation is der?

Infection likely: What you describe seems very consistent with a vaginal infection or urinary tract (bladder) infection or both. The symptoms should motivate you to be checked by a gynecologist. Other more serious concerns such as chlamydia, cervical cancer or precancer or even a retained foreign body (a old tampon) could be at play. Best to get checked and treated asap.