Define the rub: something that causes a difficulty or problem â the rub in a sentence something that causes a difficulty or problemâ¦ See the full definition
Knowing the difference between lice and dandruff can help heal your scalp condition properly. Lice are infectious parasites and dandruff is a self-contained scalp condition. Dandruff comes from the head, and flakes off. Dandruff is due to the excessive shedding of dead skin cells from the scalp, and lice are wingless insects (small bugs) that infest the hair and scalp. The methods of prevention and treatment also vary between lice and dandruff.
Learn About Head Lice. What are head lice? Head lice (pediculus humanus capitis) are small, grayish-brown, wingless insects that are roughly the size of a sesame seed (found on a burger bun) when fully grown. They need to live in warm (31C +) humid conditions and feed off human blood obtained by biting the scalp.