crusty dandruff appears on parts of the hair that a person touches

allergy arm baby brown burning care caused closeup condition corporis crust damage dandruff dermatitis dermatology dermatophyte dirty discomfort disease dry ear epidermis eye finger fungi fungus hair hand head health hormonal human hygiene issue itchy leaf leg limb malassezia medical medicine messy mycosis nail newborn nose organ people problem psoriasis rash restricta scab scalp scaly seborrhea seborrhoeic sebum skin soil stuck texture treatment ugly wet wood