Answer:
Infections of the scalp include bacterial infection of hair follicles (folliculitis), infestation of head lice (pediculosis capitis), and fungal infection of scalp ringworm (tinea capitis). Itching and excessive flaking of the scalp is seen with both dandruff (seborrheic dermatitis) and psoriasis.
Explanation:
Folliculitis- It is usually caused by a bacterial infection, viruses, fungus, and even parasites, such as worms or mites. Types of folliculitis include: Bacterial folliculitis. Over 80% of folliculitis cases are caused by bacteria, usually Staphylococcus aureus, a type of bacteria that lives on everybody's skin.
Pediculosis- capitis or head lice can easily be caused by active infestation from another person with head lice.
Tinea Capitis- is an infection of the scalp (head) which is caused by a fungus. It is also called ringworm. (This is not caused by a worm.) It occurs most often in school-age children but in rare cases can also affect adults.
Seborrheic Dermatitis- Doctors don't yet know the exact cause of seborrheic dermatitis. It may be related to: A yeast (fungus) called malassezia that is in the oil secretion on the skin. An irregular response of the immune system.
