Mikey

could be that you have a low level infection there that flares up every time your immune system takes a slight dip, for example during chelation which is stressful to the body.

You could either try some natural anti-fungal or antiviral like GSE or OLE to try and clear it up, or support your adrenals so that they can produce the extra cortisol to clear up the infection. Or both.

My two cents..

Best

Nicola.