A Pterygium is a common triangular growth from the inside corner of the eye extending toward the cornea. It’s more common in the tropics, but nobody knows why it forms. It’s not dangerous. The only bad consequence occurs if it grows far enough onto the cornea to obstruct vision. In that case, a simple surgery can remove it; no need to operate sooner.
Pterygia (the plural) can become reddish if inflamed. No harm will occur. There’s no good treatment for it. Over-the-counter drops of various sorts may help, so may placebo. Sorry. Here’s a picture: