How can I stop the flare out of the bottom layers?
The picture is not very clear so this can be related to either:


Overextrusion at the bottom layer (slicer setting) or an incorrect bed leveling (bed to nozzle distance too small), or
this could be the effect called "elephant foot" that is primarily caused by printers with a heated bed. This issue is related to unbalanced printing parameters: heat bed temperature (too high) in combination with insufficient part cooling.


The general remedy for these problems is to level the bed (e.g. nozzle can be too close to the bed). "Elephant foot" can be reduced by reducing the heat bed temperature, re-positioning the cooling nozzle and/or start cooling at a lower height. Please experiment with the print parameters by printing XYZ 20 mm test cubes till you find the correct settings.