The most common type of lump at the back of the head is a rich lump. This is mainly due to the formation of local subcutaneous fat thickening, the main reason is due to excessive obesity, among obese patients, very easy to cause local fat accumulation, such as this situation does not cause obvious symptoms, usually will only be manifested as a local impact on the aesthetic. If you want to make the rich bag reduce or disappear, you must first lose weight, eat more light food, eat less fatty food, and actively engage in sports. If the rich bag is too large, you can also undergo surgery to remove the rich bag.