Not certain: It sounds like there is a fluid collection in the skin behind the ear. Questions to ask yourself: is this soft? Does it move when you touch it? Is it painful or red? Have you had any surgery in this region? There is a natural " lump" behind the ear that is called the mastoid process. This can have an infection and if there is surrounding fluid this may be the fluid lump rthat you see. See your dr.
Answered 7/6/2019
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