I have a red wound on my left thigh and it won't go away. Can you suggest medication to get rid of it?

Needs to be seen. Wounds like you are describing need to be seen in order to be properly evaluated. I would suggest going to see your family doc or a dermatologist for this. They should be able to help you or point you to folks who can.
Infection? See md for possible infection .Redness from non infected wound will heal over time.