The scalp is unique among skin areas in humans, with high follicular density and a high rate of sebum production. The relatively dark and warm environment on the scalp surface provides a welcoming environment for the superficial mycotic infections associated with many scalp conditions and for parasitic infestation. Infections and infestations can occur when items such as fingers, combs, hats, or styling implements come into contact with the hair and scalp and introduce micro-organisms. Inflammatory conditions may also produce changes in the scalp.
A number of common scalp conditions include dandruff and psoriasis. Treatments usually involve topical applications on the scalp, which is why a good choice of suitable hair care products is important.