  We have investigated the effect of weak disorder on the ground state of a two
dimensional electron gas in the quantum Hall regime at filling factors slightly
deviating from unity. The skyrmions and antiskyrmions are found to be present
even at filling factor $\nu=1$. They may be strongly squeezed by the disorder.
We have studied temperature effect on skyrmion density and size.

Mesoscale and Nanoscale Physics;Strongly Correlated Electrons