2 year old son has red hot bumps on palms, bumps on arms, ankles & a couple on his side, flea bites? Hfm disease? Chicken pox? How to tell difference?

NEEDS to be seen. It's hard to tell by description--so he needs to be seen to get a diagnosis. Chicken pox seems least likely but 'hot bumps' is concerning for an infection/cellulitis.