My 3 year old son keeps getting recurring eye infections that look like a sty, it forms a big puss filled head.this is now the 4th one within 2 months, they clear up and then another one starts. do we need an antibiotic ointment to treat it?

This can be difficult. Simple sty's will often resolve with warm compresses. When they are recurrent like this, the kid is often harboring an invasive staph germ in their nasal passages or skin that may require treatment. Bathing in water with a cup of bleach added (1cup/20 gallons) can reduce staph on the skin. I would confer with the kids doc about treatment options.