They look like a sort of mealy bug to me. Spray isopropyl alcohol on them and if they turn red then definitely mealy bugs.
Get a cotton swab, spray it all down with alcohol and wipe them away and that should clear them up! Luckily they are pretty large and easy to see (at least more than other pests).
Yeah my Pilea constantly did this and other more wacky curling. I moved it further away from the sun so it got indirect light and it liked that better.