  We present JHK infrared data from the UK Infrared Telescope for a subset of
the regions of the MYStIX (Massive Young Star-Forming Complex Study in Infrared
and X-ray) survey. Some of the data were obtained specifically for the MYStIX
project, and some as part of the UKIRT Infrared Deep Sky Survey's Galactic
Plane Survey. In most of these fields crowding is a significant issue for
aperture photometry, and so we have re-extracted the photometry from the
processed images using an optimal extraction technique, and we describe how we
adapt the optimal technique to mitigate the effects of crowding.
