Allodynia

Allodynia refers to central pain sensitization (increased response of neurons) following normally non-painful, often repetitive, stimulation. Temperature change, light touching, and clothing can trigger the pain response resulting in a burning sensation often occurring after an injury to a site.

Presentation
There are three types of allodynia. Tactile, where pain is caused by touches such as clothing touching the skin or someone lightly touching the arm; Mechanical, caused by movement across the skin when drying with a towel or sheets brushing against the skin; and Thermal, which is caused by heat or cold that is not extreme enough to cause damage to skin tissues.

Allodynia in ME/CFS and Fibromyalgia
Both ME/CFS and fibromyalgia (FMS) patients can experience allodynia in any one or all its forms. Although ME/CFS and FMS patients have reported allodynia, it has not been studied in either condition.

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 * Wikipedia