You probably have milium, filled with clear fluid. It may feel itchy but not painful as your symptoms are. Scratch with strike spud it will evacuate and that's it.

Sounds like you could have an internal hordeolum or a stye (infections of the glands inside the eye lids). 1) Hot fomentation over the swelling 2-3 times everyday should take care of it. 2) oral antibiotics like Azithromycin 500mg for 3 days. 3) Proper lid hygiene is a must for prevention. Clean you lid margins using a ear bud dipped in a solution of warm water and Johnson 's baby shampoo regularly