If burning, crusting, redness and/or blurred vision occur in the eye itself, the bacteria draining from the stye could be causing a secondary ocular infection, and medical attention should definitely be sought. If inflammation from the stye spreads deeper, especially if it starts to involve the entire eyelid or even both eyelids, this could represent a much more serious infection called preseptal cellulitis which would require an oral antibiotic. If left untreated, these deeper infections could potentially progress to the entire bone around the eye, or orbit. Seeking consultation with an eye care professional is essential in any of these cases. There can also be a hard bump in the lid left behind after the active infection in the stye clears, which is called a chalazion. These bumps consist of blocked up oils and dead skin cells, and are generally painless. They could remain for weeks or months, with very persistent ones sometimes requiring removal by an ophthalmologist using a small incision into the lid.