Small, painless ear pimples with rough or thick skin are frequently caused by keratin accumulation, plugged pores, or moderate conditions like seborrhoeic dermatitis. You can apply a moderate moisturiser or antiseptic lotion externally, keep the area clean, and refrain from picking or sticking things inside the ear. See a doctor to determine the reason and receive appropriate treatment if the skin thickens, spreads, or begins to discharge or itch excessively.