Swollen leg leaking fluid, but not lame

It doesn't seem to bother him. I am not calling a vet.

I am asking for others to brain storm the issue. Not critique my ownership. Thank you.

I'm not critiquing ownership at all, I'm simply stating that liquid oozing from pores is out of the regular owners knowledge level. It could be so many things but it needs a vets attention. At least call one and talk on the phone. If you had liquid oozing from your leg would you go to the doctor?
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If my leg was oozing, I would google it first. Maybe ask a forum.
If it became a pressing issue, I would call a doctor.

If I cannot find answers, I will call my vet.

Ok well so far pretty much every issue it could be requires a vet. And you seem very anti-calling the vet, so I am guessing you are waiting for someone to say "my horse had this too, it went away on its own, you don't need a vet".

Not sure what you are looking for. If it were my horse, I would call my vet and talk with them over the phone, and go from there. My vet and I have a wonderful relationship and he would tell me what needed to be done.
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You have obviously googled it and asked a forum and you do not have a definitive answer. What else has to happen before you call a vet?

Can't you call your vet and at least ask them if it sounds serious with out them charging you?

It *is* chronic. You stated in your OP that this has been happening "for quite some time." That is the very definition of chronic.

Off an on. About every month, for the 8 months i've had him. To be specific.

It swells for a day, max. Then goes back down on it's own.

Quicker with exercise.

Another possibility may be an allergic reaction to something. If I couldn't find a clear reason for a horse's leg leaking fluid out of it's pores I would be calling a vet. I also have googled what you described and the possibilities are more than I would want to deal with alone.

Off and on for eight months (at least) is too long for a leg to be dealing with chronic stocking up. Could be anything from cellulitis to a reaction to a toxic weed, but regardless of what it is, the horse needs to see a vet. If he is stocked up enough for (what you are presuming is) lymphatic fluid to be oozing out his pores, I would be concerned about what effect that chronic systemic reaction is having on the connective tissues in that leg.

This is what I found, I am thinking this is the cause:

One is caused by a problem with the lymphatic system ( responsible for fluid drainage ) the other is caused by a breakdown in the synovial membrane

TB's often get a breakdown in the synovial membrane which causes the legs ( starting low down ) to fill with leaking synovial fluid ( hence filled leg )

If you massage the lower legs and walk the horse out for about 20mins it should start to go away - it's not normally a problem ( a couple of mine had this condidion ( OTTB's ))