It is possible that pineapple could irritate your skin because of it's high Sugar and acidic content. I have had eczema all over my face before and it can be very debilitating. I could not eat pineapple or other acidic fruits.
I healed myself with colonics treatments and a very pure diet. Lots of water. Green juices daily. No carrot juice though---that has a ton of Sugar in it and would cause my itching to get worse.
I wish you the best in your healing.