Purple spots on the earlobes may be caused by mosquito bites, local skin allergies or trauma. 1. Mosquito bites: mosquitoes are more common in the summer, if the bite will occur after the local skin inflammatory reaction, resulting in red or purple spots, accompanied by itching. 2. Local skin allergy: may be caused by contact with allergens caused by capillary rupture bruising, often lead to skin redness, swelling and itching, in the process of absorption of bruising can be a bit of purple spot signs. 3. Trauma: for example, crush injury or collision may lead to subcutaneous hemorrhage, causing local bruising, resulting in small purple petechiae. Earlobes with purple spots may also be caused by other reasons, it is recommended to go to the hospital in a timely manner to identify the cause of targeted treatment.