There's a hard pimple in the skin.

A hard lump in the skin is common with sebaceous cysts or lipoma symptoms. Sebaceous cysts and lipoma belong to the normal human body, a benign skin tumor, under normal circumstances is not any uncomfortable performance. If the long part is special or grows larger, there may be local pressure, pain, can be surgical resection treatment. If sebaceous cyst or lipoma secondary infection, can cause local redness, pain, but after active anti-infection treatment redness, pain phenomenon will gradually subside. The above health science knowledge is for reference only, the specific situation needs to go to the regular hospital examination, by the professional doctor to judge.