If you have a lump on your earlobe, it may be caused by the following two reasons: 1. After your earlobe has been pierced, the metal or plastic material may stimulate the wound for a long time due to the long-term wearing of earrings, resulting in localized chronic sterile inflammation, which may lead to hard nodules after a long time. 2. 3. If some patients eat foods that are easily inflamed or stay up late, it can also trigger the onset of inflammation and localized redness, swelling and pain. It is possible to confirm the diagnosis by taking a local ultrasound.