M.H.
Hi K.,
The reason I answered you is because you said you haven't changed any soaps or diet or anything. Changes don't need to be made in order to have a reaction. If he is absorbing toxicities they are bound to show up eventually. I'm not saying that it is a toxic reaction but most people do believe that if something doesn't bother you at first...or even for months and years....that it is safe. Synthetic chemicals react and contraindicate. A new pesticide in the baby food could contraindicate with a different preservative in the same laundry detergent.
Topically I always go to high grade tea tree oil because it absorbs deep and is not only antiseptic but antibacterial and antifungal. If it is toxicities a cleansing of the digestive system may help. The only way you can really do that at his age is a little prune juice everyday. Everyone should "go" after every meal....even little ones. That's the only way to keep clean.
If it is this, it's an easy fix. If you can't get to the bottom of this soon...see someone else about it. No one is perfect and that includes our favorite doctors.
God bless,
M.