Hello and thank you for your question. I'm going to ask one of my fellow gardeners for his help with this and expect that he'll be in touch with you before long.
Jeanne

Good morning,
I've forwarded your question to an entomologist at Penn State for identification. He's the person who can answer it best.
Jeanne

Thank you.  Looking forward to what he has to advise.

Those look like some kind of soft scale. I'd have to slide mount them and know what the host is to identify them further. It looks like the plant is potted? If it's small, you can probably hand pick the scales off and dispose of them. Monitor for additional scales and hand pick as necessary. You may also apply horticultural oil or insecticidal soap in addition to or in place of hand picking.