  Study of quasi-periodic oscillations (QPO) in blazars is one of the crucial
methods for gaining insights into the workings of the central engines of active
galactic nuclei. QPOs with various characteristic time scales have been
observed in the multi-wavelength emission of blazars, ranging from the radio to
gamma-ray frequency bands. In this study, we carry out a comprehensive
variability analysis of the BL Lac object 4FGL 2022.7+4216 detected by the
\textit{Fermi-}LAT, over a period of more than three years, from April 27, 2019
to August 09, 2022. By utilizing multiple widely-used methods of time-series
analyses, we detect the presence of quasi-periodic fluctuations with a period
of $\sim$100 days with a confidence level exceeding $4\sigma$. This is the
first time such a variability feature pertaining to this source is being
reported. We propose that the observed QPO may be related to the precession of
the blazar jet with a high Lorentz factor or to the motion of a plasma blob
through the helical structure of the jet. However, for a decisive conclusion on
the physical origin of such fluctuation, further multi-wavelength complementary
observations, especially Very Long Baseline Interferometric observations, would
be required.
