Answer: The sap you mention is normal and will stop oozing as soon as the wounds heal. Ficus weeps when pruned in the summer. If you need to prune it back again, try doing so in the late winter when the plant is nearly dormant. Without so much fluid coursing through the tissues, the wounds will barely drip. Grape vines drip what seems like buckets of water if they've been pruned too late in the spring, too, so weeping isn't all that unusual a circumstance.
Black or brown bumps on the undersides of leaves suggest scale insects. The hard cases protect these insects from predators (and insecticides), and allow the insects to feed undisturbed. The best way to control is to pry them off or squish them and then wash the residue from the plant. The scale insects suck juices from plants, resulting in yellowing or mottling of the leaves. As soon as you get the insects off the plant, the damage should stop.
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