Bump on the eyelid; Stye
In addition to the red, swollen bump, other possible symptoms include:
A doctor can diagnose a stye just by looking at it. Special tests are usually not necessary.
Mueller JB, McStay CM. Ocular infection and inflammation. Emerg Med Clin North Am. 2008;26:57-72.
Rubenstein JB, Jick SL. Disorders of the conjunctiva and limbus. In: Yanoff M, Duker JS, Augsburger JJ, et al, eds. Ophthalmology. 2nd ed. Philadelphia, Pa:Mosby Elsevier; 2004:chap 55.
Neff AG, Carter KD. Benign eye lesions. In: Yanoff M, Duker JS, Augsburger JJ, et al, eds. Ophthalmology. 2nd ed. Philadelphia, Pa:Mosby Elsevier; 2004:chap 92.