  Numerous extended sources around Galactic pulsars have shown significant
$\gamma$-ray emission from GeV to TeV energies, revealing hundreds of TeV
energy electrons scattering off of the underlying photon fields through inverse
Compton scattering (ICS). HAWC TeV gamma-ray observations of few-degree
extended emission around the pulsars Geminga and Monogem, and LAT GeV emission
around Geminga, suggest that systems older than 10-100 kyr have multi-TeV
$e^\pm$ propagating beyond the SNR-PWN system into the interstellar medium.
Following the discovery of few $\gamma$-ray sources by HAWC at energies E$>100$
TeV, we investigate the presence of an extended $\gamma$-ray emission in
Fermi-LAT data around the three brightest sources detected by HAWC up to 100
TeV. We find an extended emission of $\theta_{68} = 1.00^{+0.05}_{-0.07}$ deg
around eHWC J1825-134 and $\theta_{68} = 0.71\pm0.10$ deg eHWC J1907+063. The
analysis with ICS templates on Fermi-LAT data point to diffusion coefficient
values which are significantly lower than the average Galactic one. When
studied along with HAWC data, the $\gamma$-ray Fermi-LAT data provide
invaluable insight into the very high-energy electron and positron parent
populations.
