Spray it thoroughly with some rubbing alcohol - could be mix with some water or full strength. Keep out of sunlight while treating. Check other plants that were close by as many bugs spread. Many bugs (like mealy) do not disappear on their own.

End of stem looks quite dark, it may be good time to behead and re-root. If you do that, make sure cut end is callused before putting into fast draining mix. Can't tell for sure from photo, but existing mix looks like original peat. You could get a bag of Cacti&Succulent soil and bag of perlite. Sift perlite, mix 50/50 with C&S soil. Or go for gritty mix if convenient - search this forum for it.

If you live in the USA I would suggest trying to get an insecticide with imidacloprid in it. I think the one called Bayer Tree & Shrub has it.

I would use rubbing alcohol first - it really helps unless there is huge infestation, it is more 'friendly', easy to buy just about anywhere and less expensive too. I have nearly 300 succulents, and always use rubbing alcohol. In 5 years, it always helped.