My husband has developed a skin rash.

My husband (50) developed a skin rash about 2 weeks ago. It's mainly on his legs, arms and top part of his chest and is very itchy.

He is also complaining about mild muscle ache. His face became very swollen about three days ago, particularly around his eyes where it is very puffy and red. His earlobes are also swollen and peeling.

He doesn't have fever, his tongue appears normal and he can bend his head forward. His on chronic medicine for asthma. We've been using Calamine lotion for the itching. What can this be? Should he see a doctor?