Round gray bump on top of feet, almost flat. i felt an itch then saw it and the top of it came off & now gray bump left. also had raised flesh bumps?

Grey bump on foot: The flesh bumps may be skin tags which are mostly cosmetic or may be early lichen planus(benign) . The grey bump needs evaluation -may be fungus , lichen planus https://www.aad.org/public/diseases/rashes/lichen-planus#treatment , seborrheic keratosis , eczema or mole that needs to be removed F/u/ w/ dermatology

Have a dermatologist: evaluate it especially if you have had a lot of sun exposure during your 40 years, may require a biopsy.