Large-scale surroundings of EGO G338.92+0.55(b). Left-panel: Overview of the H II region G338.90+00.60 at Spitzer 3.6 (blue), 4.5 (green), and 8.0 (red) µm bands. The white contours represent the continuum emission at 870 µm extracted from the ATLASGAL survey. Levels are: 1, 3, 6, 9, and 12 Jy beam⁻¹. The green square highlights the region studied in this work, which includes the position of EGO G338.92+0.55(b) represented by the yellow star. Right-panel: A close-up view of the EGO at the same Spitzer bands. The black contours represent the ALMA continuum emission at 340 GHz (7 m array). Levels are: 0.2, 0.4, 0.7, and 1.4 Jy beam⁻¹. The beam of the ALMA observation is indicated in the bottom-right corner. The blue, green, and red colour scales go from 10 to 500 MJy sr⁻¹.