Hi, my son used to get a lot of eye infections, the pimple on the lash line you mention is an infected eyelash. It seems to be common with long lashes. He used to get them one after the other. My research led me to Colloidal silver and to make sure he eats some raisins everyday (obviously nutritionally something was lacking). He did not like the Colloidal silver drops he said they stung, so I use a tea bag, any kind, herbal, black etc, dunk the bag in boiling water and when cool enough squeeze and apply to eye. Laying down is easier. Several times a day for as long as you can keep it on him. Recently we had another infection and I suspect the cotton wool with cs and it cleared up really well with one application but I think we caught it early as well. Also for your son something to help the inflammation internally a lot of the Indian cooking spices are good like cloves, cinnamon and turmeric. Maybe some turmeric 1/4 tsp in some warm milk with pure honey twice a day.