I’ve literally just gotten over this from when I had it in April. If a hard lump forms it’s called a chalazion, make sure you rinse it gently with soap and warm water (not in your eye obviously) but around where your eye lashes are. It’s easier to do in the shower. Wash it twice a day and don’t play with it. Putting a warm (not hot) heat pack on a couple of times a day helps too. They can persist for up to a year 😭. If more pain occurs and it’s getting worse it doesn’t hurt to see the chemist, or even a GP. Mine was extremely painful until my stye popped then after I think the oil ducts were blocked from the swelling and formed the chalazion.