My son has red small bumps on his cheeks ... it’s really red .. what can that be .. can absorb dusting powder be used on that

A. check any allergic reaction. stop using cosmetics, soaps, bathe with clean water,  also some babies get allergy due to clothing.use regular cotton clothes. skip the suspected item apply soothing lotion or ice if itching. consult in emergency if breathing difficulty, any facial swelling