Is it still okay to use?

I cut and avocado in half two nights ago and used only one half for a hair mask. I wrapped the other half in a sandwich baggie. It's only been two nights now, but the other half already looks to be rotting. I was planning on using the other half tonight for the same hair mask but idk if i should since it looks to be shriveling a bit and some parts are brown. I just want to know if it's rotten and if it would still be okay to use for my hair mask? If it matters I do mash it up anways for the mask. Thanks