Healing brush
The healing brush removes blemishes by replacing them with texture from a source area, while taking on the color and brightness of the surroundings. Unlike the clone stamp, it blends the edges automatically. That makes repairs virtually invisible.
Hold Alt and click a clean source area, then paint over the spot you want to fix. Photoshop borrows the texture but matches the color and tone to the surroundings, ideal for skin blemishes or dust spots. Work on an empty layer with Sample All Layers on, so it stays non-destructive. Tip: pick a source with the same light direction, otherwise you still see the difference.
Read also the in-depth explanation: Healing brush explained.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.