a) *b-arχV-n ("something cut > wound > pus, abscess"): Lezg. barχun 'pus', Tab. barχun 'pus, abscess', Ag. balχun (Fit. barχun, Burk. balχun; -l- in Rich. and Burk. is not quite clear - perhaps from *b-arχV-l with shift of liquid ?) 'pus';

    b) *ƛ̣:-irχV-t: with the same meaning: Rut. girχɨd 'abscess' (note the -i-vocalism reflecting the old Avlaut *a/i).

    Semantic shifts like "to cut" > "wound" are rather usual in Caucasian languages, thus all the listed derivates belong to this root with high probability.