Small brown drops on the leaf

hello, a few days ago I was checking the plants and in one plant I found these little brown drops on the leaf. The consistency is quite runny but some were a bit sticky. The plants look healthy and present no problems. Last night, after I had removed them days before, I found another one but honestly I don't know if maybe I hadn't seen it and so it stayed there for a few days. thanks in advance for who will help me.
 

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