Hello moms! Can you tell me if it's an allergy or a bite or something…

Hello moms! Can you tell me if it's an allergy or a bite or something else? I noticed three dots yesterday evening, today there are more and redder. The dots are only in the belly area. I haven't tried anything on my toes these days, we didn't change powders, we use one brand for a year now. What could it be?