Skin Rash

I am 42 - three years post diagnosis. I have a rash on me which started a few days ago. It started on my stomach and was a little bit on arms and legs. I went to the Dr (yesterday) who said she thought it was a viral rash probably german measles. It has now become much thicker around my chest and neck area. It is quite itchy at times. My question is what do skin mets look like and what areas do they appear in. Thanks.