A pimple will form in your ear if the oil is unable to escape or bacteria grows in a clogged pore. A buildup in bacteria can be caused by a few things,

such as sticking your finger in your ear or using earbuds or headphones that aren’t cleaned often. Other causes of acne include stress and a hormonal imbalance.Wash your skin and ears regularly. …
Ice the surrounding area. …Apply an over-the-counter acne spot treatment: Topical products like benzoyl peroxide (Benzoyl) or salicylic acid spot treatments can help reduce bacteria and decrease the production of sebum. Full video