Brown spots on my fig tree

Are the leaves falling off? Are the spots just plain brown or are the leaves loosing their colour and becoming yellow? If they don't I would not be too worried. Take a couple of the affected leaves to the garden centre if you notice any of those signs. It could be a fungus and they will be able to give you a treatment.

Bird poo?

 I have been thinking about the problem and, jokes apart....very funny Gerbillo, sometimes severe hailstorms can trigger a fungus or bacterial infection in plants and trees. Hailstorm damage is easy to detect but an infection is more complicated. There are some excellent copper based treatments. Talk to the garden centre people particularly if you see the leaves turning yellow or brown and falling.Best luck!