this is a moon valley pilea. it had an infestation of thrips that ruined a lot of older leaves; they have since been trimmed off and the stems have been washed and treated with neem oil. it’s been mad for a while, but it now growing some baby leaves. however, there is a now white spot on the top of one of the stalks. i don’t know what this is? at first i was scared it may be the start of mealy bugs but i don’t really think that’s what it is. i’ve never had mealy bugs before, though, so can someone help identify what this is and if i need to do something about it?