Help with mandatory reconsideration

Hi everyone
I'm after a bit of advice regarding my mandatory reconsideration for pip that I'm putting together, I have a rare illness called solar urticaria which is an allergic reaction to sunlight and visable light, obviously it affects me when I'm outside as a reaction occurs after a couple of minutes, resulting in a nasty skin rash that doesn't disappear, and gets worse with any further exposure, so I'm not safe outdoors and can't repeatedly go outside from late February-late September/early October, under what descriptor would it fall? With regards to the mobility questions, I'd appreciate any advice on how to add this

Thank you Gordon, I will have a look at that now, it could prove quite useful it terms of my own illness.

I've had a look at the guide Gordon and yes I can adapt it to my own situation quite well for going out, I also came across something I wasn't aware of about an upper tribunal verdict on engaging with other people,
Engagement is needed
An upper tribunal judge has ruled that ‘isolated and specific’ examples of being able to interact with other people, such as being able to talk to the health professional at medical assessment or to staff in a local shop you go to regularly are not enough to prevent you scoring points. In this case the claimant went to the pub and a chip shop every day, but said she avoided any engagement with other people and would move away if anyone stood next to her. She was able to respond to the PIP heath professional’s questions without prompting and had adequate eye contact and rapport.

The judge held that simply going to the pub and the chip shop or responding to questions from a health professional was not evidence that the claimant engaged socially with other people or would be able to engage with people she did not know well.

The assessor said on my report that because I could engage with her I could do this on majority of days, which simply isn't true as I explained to her that I can't engage social with people who I do know well apart from my immediate family and people who I don't know is near on impossible.
So thank you for pointing out the guide to me, because I've had a good read with my parents and we've come across arguments that we would never have thought adding.