Sore toe on left foot?!

Sore toe on left foot?

I've got a sort of sore on my toe, and it's really painful. I normally do get a few sores on my feet, but they go away in a few days, and I've had this one for nearly a week. My sister's got a verruca, and I think she may have passed it to me. Should I use the Sacylic Acid Paint presribed to her or not?

6 days ago
The sore is black surrounded by a yellowish/brown thing...

Don't use someone else's medicine...if you don't have it you will by the medicine coming in contact with her and then touching your skin!!! Put an antibiotic ointment which you can buy over the counter at a drug store on it. If that doesn't fix it see a doctor.