Chen Leng has a red mole on his eyelid?👀 And what's with the violin? Sherlock?

I think it was in the earlier chapters where he met his aunt in the dream and he is sooo proud to tell his aunt how he mastered the violin and want her to hear it

Oh right, I remember now... thanks!

He always had that mole on his eyelid + one on the bridge of his nose. They are both red moles so they're not always easy to spot.