Problem With An Old Tin

Before I begin, I don't smoke a pipe hardly at all. If I do, it's in the winter and usually only 5-10 times a year. I do enjoy my pipe, but not nearly as much as my cigars. Anyway, I was just going through some old tins I bought at least 5 years ago and opened up a tin of Esoterica And So To Bed. I found what looks like rust around the edge of the tin. Is this the oils that began to rust on the tin? Is my tobacco still ok to smoke?