While long-range PCR is typically used to overcome this, skewed X-inactivation detection can also aid in assigning variants to IKBKG. We employed a comprehensive approach, incorporating whole-exome sequencing (WES), long-range PCR, RT-PCR, X-inactivation analysis, and nanopore sequencing, to identify and accurately phase a small heterozygous deletion, NM_001099857.5: c.363_367del, p.(Leu122Glyfs⁣∗14), in the IKBKG gene in an IP-affected family. This evidence concerns the gene IKBKG and incontinentia pigmenti.