Our expert says:
It sounds as if it could be hives if it responds to cortisone but may also be a type of acne (cystic acne) Have you seen a dermatologist? See if taking an antihistamine every evening makes a difference? (try something like Loratidine)It may be related to something you eat, so see if you can identify possible triggers. You could also ask your GP to test you for allergies for most common foods (usually nuts, citrus, tomatoes, fish, iodene, wheat).
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