The five different indications listed here, each contributes to the suspicion that there are lice in the hair. Suspicion should not result in a headlong eradication process; however, it can be a cause for inspection.
1. If you see one or more small, red patches on the scalp especially behind the ears the back of the neck. This kind of “bite mark” can occur for various reasons. One of them may be a head louse.
2. Itching in your hair – more than usual – brings lice to mind. Be aware of children who are scratching themselves. There may be other causes of itching of the hair (e.g. ringworms, etc.) so itching in the hair always deserves further investigation.
3. Small black grains, as a fine sprinkling of pepper, on clothing at the back of the neck and on shoulders or on the pillow can be excrements from lice. Test for blood as with flea excrement.
4. Small, pale live animals of lice size, which sprinkles from hair or hats, can be lice. It can also be completely harmless little creatures that have strayed. You can either determine the species of the animals, or check for lice.
5. If you have been exposed to infected people, it is reason to look for lice
"Pests in House and Home"
"Bed Bugs - Bites, Stings and Itches"
"Food Pests"
"Husets dyreliv" (Insects Around the House - Only danish)
"Skadedyr i træ" (Timber Pests - Only danish)
"Stuefluen" (Common Housefly - Only danish)