What Causes Pain During Urination Due To Bleeding Of The Labia?

hi ...don't know if u can help me....I have been suffering from painful urination due to bleeding on the right side of the labia. My dr gave me keflex and hc oint. I have not had intercourse in months ,,,and the vagina is fine. what could have made this happen and hoping for a second opinion for a treatment. I can't wear anything from the waist down.....everything is painful to wear. Please help...