One common reason for a bump or swelling on the eyelid is a stye—a small, painful lump caused by an infection in one of the tiny oil glands near the base of your eyelashes. Styes often look like pimples and may cause redness, tenderness, or watery eyes. Another possible cause is a chalazion, which occurs when an oil gland becomes blocked, forming a firm, painless lump that develops more slowly. Both conditions are typically not serious and can be treated at home by applying a warm compress several times a day to reduce swelling and help the gland drain naturally.

However, not all eyelid issues come from blocked glands. Sometimes, what looks like a bump may be an allergic reaction, a sign of blepharitis (inflammation of the eyelid margins), or even irritation caused by cosmetics or skincare products. If you’ve recently changed your makeup, face cream, or eye drops, it might be worth pausing their use to see if the irritation improves. Maintaining clean eyelids by gently washing with mild soap or baby shampoo can also help prevent future flare-ups and keep the area healthy.

If the bump persists, grows larger, becomes painful, or affects your vision, it’s important to consult a healthcare professional. Persistent eyelid changes may require medical evaluation to rule out infection or other conditions that need treatment. In most cases, though, these bumps are mild and temporary. Taking care of your eyes, keeping the area clean, and avoiding rubbing can go a long way toward healing and preventing future irritation.