S.S.
Hi J.,
My 15 mo used to suck his thumb also. He wound up with a crack on his thumb and I would put the lanolin you use for breast feeding on his thumb to keep it moist. It is safe for him to ingest. If the blister is still intact don't pop it. When it does pop try the lanolin unless it looks infected then you will want to put neosporin or something of that nature on it. You may want to talk to your Dr. to see what is best. My son did stop sucking his thumb after it cracked. Hope this helps.