Symptoms - Head Lice

The most common symptom of lice is itching. There are different symptoms, depending on which type of lice you have.

Head lice may not cause any symptoms at first. Itching on the scalp may start weeks or even months after lice have started to spread. Scratching can make the skin raw. The raw skin may ooze clear fluid or crust over, and it may get infected.

Pubic lice cause severe itching. Their bites may cause small marks that look like bruises on the torso, thighs, or upper arms. If pubic lice get on the eyelashes, the edges of the eyelids may be crusted. You may see lice and their eggs at the base of the eyelashes.

Body lice cause very bad itching, especially at night. Itchy sores appear in the armpits and on the waist, torso, and other areas where the seams of clothes press against the skin. The lice and eggs may be found in the seams of the person's clothing but are generally not seen on the skin.

Frequent scratching can cause a skin infection. In the most severe cases of head lice, hair may fall out, and the skin may get darker in the areas infested with lice.

How is a lice infestation diagnosed?
A doctor can usually tell if you have lice by looking closely for live lice or eggs in your hair. He or she may look at the lice or eggs under a microscope to be sure.

Your doctor can also find pubic lice and body lice by looking closely at your body or your clothing.