Burning skin sensation from under breasts to groin. no rash or swelling can be seen. no new medications or personal products. what could it be? ty

Nerve dysfunction: Something, is causing a dysfunction, or irritating your sensory nerves, the nerves involved in sensation. One possibility, is what we call small fiber neuropathy. Or a degeneration of the nerve fibers that are involved in sensation. This is common with autoimmune disorders such as lupus. Another, less likely possibility is a lesion in your spinal cord. This is less likely,