If the earwax is brown and oily, it usually indicates that the sebaceous glands in the external auditory canal are producing more sebum, and the oily earwax is formed by keeping the earwax for a longer period of time.
Earwax can be called cerumen, if the cerumen is brown, it is usually due to the oily cerumen that is formed when the cerumen is retained for a longer period of time. The oily cerumen can be yellow in color, and its prolonged presence may lead to darkening of the color, which may result in the phenomenon of earwax being brown and oily, which is a normal phenomenon rather than a disease, and usually does not need to be treated with any special treatment.
It should be noted that oily cerumen is not easy to be discharged on its own and should be cleaned regularly. If cerumen accumulates, it may cause cerumen embolism and inflammation of the external ear canal, which need to be treated by a doctor.