Help are these bugs? little turtle shell things on main stems sucking sap

Plant was outdoor during veg stage, now is indoor under 250w hps and is 3 weeks into budding.

there are little grey turtle shell things growing on the main stem. when i take one off there is a wound on the stem with sap seeping out. dont see any legs or anything though

they look like white/grey barnacles

everytime i remove all of them, the next day there is more!

i dont want to keep plucking them off - it might hurt the plant

please help, does anyone know if these are caused by bugs or some kind of growth?

i can post pics if neccessary, but they look exactly like little grey turtle shells. with a turtle shell pattern
 
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