Hi there.
I read your history & concerns & feel for you.
I don't have a clear idea of your gender & shall keep my advice gender-neutral.
Please avoid sharing of undergarments & fomites with anyone let alone your visiting 'cousin'.
If you are certain you have pubic
lice, please shave the entire region below your belly button to your mid thighs.
Then apply a cream called HHMITE or PERMITE (5% permethrin) well to the above mentioned region & leave on your skin overnight. This application may be repeated after a week.
Wash all your clothing, towels etc in HOT water & dry well in the sunlight.
This should take care of your problem.
Should you wish to contact a 'specialist', then a 'Dermatologist' is the person you should be looking for.
If in Bangalore, you are most welcome to drop into VIKRAM Hospital or Sita Bhateja Specialist hospital for an assessment or you may use this HCM site to source one nearest you.
Good Luck & take care.
Dr Praveen Rodrigues MD