Ultraviolet and optical data are used to look at surface inhomogeneities on the active close binary system SZ Piscium. Lower chromospheric emission lines such as Mg II h\&k, and to the lesser extend the upper chromospheric/lower transition region lines of O I 1305 $\AA$ and C II 1335$\AA$ show a pronounced decrease when the F star is eclipsing the K sub-giant. However, higher temperature lines such as the resonance line of C IV 1559$\AA$ do not show any change in flux. This suggests the presence of a plage with a high contrast at lower temperatures with a Mg II plage-to-K-star ratio of 5. Alternative explanations are explored. Monitoring of this system in the optical U-band and the ultraviolet lines such as C IV 1550 $\AA$, indicates frequent high energy (10$^{35}$ - 10$^{36}$ erg) flares.
Key words: rotational modulation - magnetic activity - plages - flares