I feel like I have a splinter in my foot ( not BACK ) but looks like nothing is there?

I checked my foot with my iPhone camera to see close up, I couldn't find a splinter. Does it mean it got inside? It has been for almost 3 days. I'm scared I don't want to get my foot an infection, my mom won't call a doctor. Or could it be a dry crack? There are huge red spots on my foot it's like a carpet burn. My foot isn't swollen yet.

Added (1). Splinter or crack dry skin? IT feels like it hurts in big area not small specific area.

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