Some plants - I believe that figs are in this group, have sap that contains a lot of natural latex - so if you've got a latex allergy you probably should stay away from the sap and the unripe fruit - conversly if you've had a bad reaction to the figs it might be a good idea to be careful around latex rubber gloves, balloons, poinsettias, (all of these were banned from certain wards of the hospital I used to work at) etc.