  We attempt to interpret the cosmic-ray positron excess by injection from the
nearby pulsar Geminga, assuming a two-zone diffusion scenario and an injection
spectrum with a low energy cutoff. Since the high energy positrons and
electrons from Geminga can induce $\gamma$ rays via inverse Compton scattering,
we take into account the extended $\gamma$-ray observations around Geminga from
HAWC for $\sim 10$ TeV and from Fermi-LAT for $\mathcal{O}(10)$ GeV. According
to the extended $\gamma$-ray observation claimed by an analysis of Fermi-LAT
data, we find that Geminga could explain the positron excess for a $30\%$
energy conversion efficiency into positrons and electrons. However, based on
the constraint on the extended $\gamma$ rays given by another Fermi-LAT
analysis, positrons from Geminga would be insufficient to account for the
positron excess. A further robust analysis of Fermi-LAT data for the extended
$\gamma$ rays would be crucial to determine whether Geminga can explain the
positron excess or not.
