The pain can be from several causes. Commonly people have what is called neuropathic pain. When the skin was injured, the nerves in and beneath the skin were also injured. This can create a condition called neuropathic pain and in very severe conditions, complex regional pain syndrome. Consultation with burn specialist, pain expert, or neurologist might be helpful. Typical pain killer are not usually helpful. Also, occupational therapy can teach you desensitization therapy.