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Context: Deep GALEX UV data show that the extreme outskirts of some spiralgalaxies are teeming with star formation. Such young stellar populationsevolving so far away from the bulk of their host galaxies challenge our overallunderstanding of how star formation proceeds at galactic scales. It is atpresent unclear whether our own Milky Way may also exhibit ongoing and recentstar formation beyond the conventional edge of the disk ($\sim 15$ kpc). Aims:Using \textit{Gaia} DR2 data, we aim to determine if such a population ispresent in the Galactic halo, beyond the nominal radius of the Milky Way disk.Methods: We studied the kinematics of \textit{Gaia} DR2 sources with parallaxvalues between 1/60 and 1/30 milliarcseconds towards two regions that showabnormally high values of extinction and reddening; the results are comparedwith predictions from GALAXIA Galactic model. We also plotted thecolor-magnitude (CM) diagrams with heliocentric distances computed invertingthe parallaxes, and studied the effects of the large parallax errors by MonteCarlo sampling. Results: The kinematics point towards a Galactic origin for oneof the regions, while the provenance of the stars in the other is not clear. Aspectroscopic analysis of some of the sources in the first region confirms thatthey are located in the halo. The CM diagram of the sources suggests that someof them are young.

High reddening patches in Gaia DR2. Possible artifacts or indication of star formation at the edge of the Galactic disk