Black spots on ficus tree
It sounds as though your ficus tree likely has scale insects. The scale insects look like brown or blackish bumps on stems (and leaves). They suck the plant sap and excrete the sticky honeydew that you observed. Scale insects are difficult to control, but you may be able to manage them by swabbing the leaves and stems with rubbing alcohol. (Most insecticides don't work well on mature scale insects because the adults are protected under their hard "scale".) You can control newly hatched scale insects with many insecticides, but the timing must be right, i.e., done before the "crawlers" develop their protective covering.
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