I think you might want to get it checked by a doctor. It could be otitis externa, or inflammation or fluid in the external ear. The treatment might be a drop. Prevention is to keep the external ear dry with a drying agent. I personally use a thin wisp of tissue paper to dry out my ears after swimming. You never want to put a q tip in the ear. Some folks uses a solution of half rubbing alcohol, and half vinegar. Some recommends third water, third alcohol, and third vinegar. I just use a very thin twisted piece of kleenex, and thread it into my ear canal - since it can't hurt the ear drum. Commercialy made ear drops are over the counter, I have not looked at them personally.
It could also be otitis media, or fluid in the middle ear. While it used to be, that some people might call this an infection, it might not be one until a couple of days after the fluid build up, and there is redness. Some doctors might treat it with antibiotic, and some with decongestant/antihistamines. And some will treat with both.
It could be a previously damaged ear drum, with a persisting hole, that allows water in. Your doctor can look at the ear and tell you if it has a hole in it.
It could be blood in your ear, from a ruptured ear drum.... It can be fluid from your inner ear - the worse case scenario, which can result in deafness.
So, we will wait for our ENT doc, hopefully he will browse through later and gives his expert opinion. I think I'll need to take more Haldol.
