Welcome and thanks for posting your query to HealthcareMagic.
As per your query you have redness
on back of hand, raised spots, chapped areas which are diagnosed as Raynaud's disease. In your query you have not mentioned your age, time period since how long the problem is present and any substance abuse
such as alcohol and smoking
with exposure to cold
Now your series of problems are basically related to Raynaud's phenomenon but of later part. In Raynaud's there is initial redness then bluish discoloration and then it turns to blackish areas.
The most important thing is cold protection and preventing any abrupt change in temperature which are the initiating factors for the same.
Stop any substance abuse such as alcohol and smoking.
I hope these information's will help you. If you have further queries I will be happy to help.
"Wish you good health"
Dr Sanjay Kumar Kanodia
MD (Dermatology )