Pubic Lice?

Hi people,

Well, here's my story. I had sex about a month ago, and contracted crabs from that person. I felt itchy in my pubic region and saw the lice and their eggs so went to the doctor who prescribed me phenothrin 0.2% lotion.

That didn't work.

So, after reading about the condition and treatments on the net, I went to the pharmacy and bought some malathion 0.5% liquid which worked and eradicated the lice.

Now, this Saturday I had sex again, and I think I may have caught crabs again. I say this because I saw an egg glued to one of my pubic hairs two days ago (didn't see any live lice though). So I put on some malathion and left it on for 12 hours as instructed on Sunday (washed it off yesterday morning), and it seems to have done the trick (touch wood).

However, as of today, I discovered a louse in my underwear, so I put it under a magnifying glass, and it isn't moving, and is a kind of crusty yellow-brownish colour, rather than the whitish/reddish colour they usually are.

Do you think the malathion application worked? Or would you say it was unsuccessful/ or the lice have developed resistance (I haven't been itching, or seen any LIVE lice yet though)?

Please help - I'm not sure whether or not to visit the doctor to get something more powerful like carbaryl, as the malathion appears to have worked again. Does it sound like it's worked? I've scanned my pubic hair, leg hair, and abdomen hair with a magnifying glass and haven't seen anything, so should I assume that the malathion worked again?

Thanks.