How can I remove stains from the head area of my leather chair.

https://www.hunker.com/13422961/how-to-remove-greasy-head-stains-from-a-leather-sofa

Cornstarch from your kitchen will work. If you're not familiar with it, it is used in cooking to thicken soups and gravies I believe the best known brand is "Argo" and comes in a pale yellow box. Sprinkle a layer of cornstarch on the stained areas and let it "sit" for a few hours or overnight. Next, mix saddle soap or a very mild soap with a good amount of water and dip a clean soft cloth in the mix and wring out well. Use the cloth to gently remove the cornstarch. Do this a few times until all traces of the cornstarch are removed. Hopefully, after the leather dries well, the stains will be gone. If not, repeat the process a couple more times. The cornstarch should absorb the oily stains eventually. Hope this helps and your leather looks beautiful again. :)

Once the leather is cleaned of the stains, make sure to condition the leather with a good leather conditioner or cleaner/conditioner. Use only products for leather. I would put something over the top of the chair to prevent absorption of oil in the future.

There are good leather cleaners and protectors available in the automotive section in your hardware store.

Best of luck! Let us know what works!