1. Sensation to the outer ear (Pinna / AUricle) is supplied by many nerves.
2. Based on the sensory nerve
supply of the top of the pinna / auricle, which is via the Greater Auricular Nerve and the Lesser Occipital Nerve, I will suggest that you get investigated for pressure on these nerves which arise from the C2,C3 level of the Cervical Plexus.
3. Treatment will be necessary only if this is progressive or worsening.