FIrst off I'm not going to be any real help with your problem, sorry about that
I have had one lepidus bitten by another on several occasions but no symptoms have ever occurred.
I would think in an extreme circumstance, the bite may be lethal, particularly if it results in an interference with respiration.
I have never heard of any treatment for this situation, but I'd be interested in hearing the outcome, because it's something I have worried about in the past.