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Painful sore on the genitalia is caused by bacterial infection and is usually caused by a bacteria called as Hemophilus ducreyi. It causes a condition called as soft chancre
where there is a ulcer which is painful and oozes blood and discharge. Groin lymph
nodes are swollen. It is a sexually transmitted disease
. Tab Ciprofloxacin
500 mg twice daily for 5 days. Avoid sexual contact till ulcer heals. Use barriers/condoms. Thanks.