Scabies is diagnosed most often by looking at the rash. If necessary, skin scrapings can be tested for the presence of the mites or their eggs. However, it is possible to have a test come back negative and still be infested.
Pubic lice ("Crabs") are diagnosed by a visual exam. While live lice may not be seen, the presence of nits (eggs) is telling enough and no other testing is needed.
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Yes. Both scabies and crabs are easily treated.
Parasitic. Scabies is caused by the mite, Sarcoptes scabei. And crabs are caused by pubic lice, Phthirus pubis.
Medicated Lotions. Both conditions are treated with specific medicated lotions; Additionally in both cases, all clothing and bedding should be washed in hot water.
Upto 2 weeks. Itching may take 2-3 weeks to go away completely.
No. Sex is not recommended until treatment of you and your partner(s) is complete.
Yes. If you are exposed to a person, especially sexually, re-infestation is entirely possible.