What is the light brown/yellowish patch on my sclera that is getting bigger?

A light brown or yellowish patch on the sclera could potentially be a condition called a conjunctival nevus or, if it seems more yellow, it could be a pinguecula. Both conditions are relatively common and typically benign. A conjunctival nevus is essentially a mole on the eye, which can darken or change slightly over time especially during adolescence due to hormonal changes. Meanwhile, a pinguecula is a deposit of fat or protein and is more common in people who spend significant time in the sun. Even though you don’t have symptoms like pain or vision changes, any enlarging or changing spot on the eye should be evaluated by an ophthalmologist. They will be able to provide a definitive diagnosis and determine if any treatment is necessary, although often these conditions don’t require intervention unless they cause symptoms or significant cosmetic concern. It’s important to note that in some rare cases, changes in pigmentation or growth could be concerning, so regular monitoring is crucial. For now, wearing UV-protective sunglasses can help mitigate further risk to your eyes from sun exposure. Given that the spot is increasing in size and darkening, it’s advisable not to delay in seeking an evaluation, just to be sure everything is okay. Always prioritize an expert review when any changes occur in the eyes.