Psoriasis and the Mandatory Work Activity from the job centre.

Hi guys, Wondering if anyone has any help and advice or even encountered this.. As the title suggests i'm currently unemployed and have been referred onto the MWA by my "Job Coach" all over the notes that she sent was the words this client has psoriasis, its pretty evident its all over my scalp, face, hands arms and legs and back. I get a text message saying that my placement is in the local recycling plant sifting through kitchen and household waste. I've had conversations with the Jobcentre and they have said that i should never have been sent, but i have to go for a risk assessment.... My question is, has anyone else ever encountered this, because it actually scares me knowing what i'd be subjecting myself to, but i have to go for a "risk assessment"? Thanks, Bav