I have been treated for severe colitis,lately large  bruises appeared on legs and arms, I accepted them because of my age 86 ,then the ones on my legs appeared with red blisters and severe itching,ice was the only relief I found,I treated the open lesions caused by scratching and there is some itching left.My legs feel hot and tight.Do I need to see a Dr? or continue to home treat?
**1. At your age [80], likely cause of red blisters could be bulbous phemphigoid [BP] which mainly affects people aged over 70, and since condition is autoimmune thus treatment/management is required to control symptom.2. Colitis is one triggering factor for BP [which is mentioned in your history]3. Thus do not continue with home treatment apart from Chat Doctor.  [may cause serious infection if left untreated]