My 1yr old Goldfish has a red spot on his/hers head?

A red spot on a goldfish may be caused by high ammonia levels.This red spot, referred to as an ammonia burn, is the result of not having a properly cycled tank or by adding too much ammonia to the tank(adding too many fish,overfeeding,etc.).The burn,if truly an ammonia burn, should turn black in the next few days.If it turns black then that means its healing and should dissapear soon.The best way to treat the burn is to put the fish in clean ammonia free water or to do many partial water changes until the ammonia levels become lower.If the redspot does not go away then it could be an ucler or tumor.