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How does one differentiate between an exoplanet orbiting in front of a distant sun and a large starspot traveling across that star’s disk?

Melvyn Goldberg, Toronto, Canada
Light-curve-exoplanet
The light curve of an exoplanet transiting its star (top) is different from that of a starspot traversing a star’s disk, so astronomers can tell the two signals apart. Astronomy: Roen Kelly
Thus we can distinguish a transit by the short duration of the dip. ... so the dip of a transit is slightly “U-shaped.” The shape of the starspot dip has gentle sides and looks more “V-shaped.”

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