Thanks for writing to H.C.M. for your query.
I have gone through your query regarding small tiny hole towards the skull near the entrance of ear, it has fowl smellingliquid in it.
Considering your symptoms in all aspects it appears to be pre auricular sinus
. This is a developmental defect and is form due to incomplete union of branchial clefts.
For treatment surgical excision of sinus tract is the only answer.