The other meaning is ‘a fly’ (CAD L 68. AHw. 533 translates the word as ‘eine grosse Mücke’; as for the contexts in which this meaning does not fit, the translation given is ‘Schwellung durch Mückenstich’.
PS
*lam(a)ṯ̣- - eruption (on the skin), white spot
(SED I No. 179)