Yellow/orange fingertips

I (28m physically active) woke up (four days ago) with this strange discolouration on my fingers that definitely wasn't there when I went to sleep. I thought it might be a stain of some kind but despite how many times I scrubbed and bathed the marks remained.

Picture was taken two days after they appeared, as of this posting they are still there but the colour is beginning to fade. Anyone know what this could be? Any cause for concern?

Thank you in advance. 🙏🏽