The rash did not change with temperature or position ... It is thought to be due to spasms of the blood vessels or an abnormality of the local circulation. It may be a dermatologic clue to a ...

If you do get a rash, you can take an antihistamine or use a cream to relieve the itch. If you feel nauseous, have diarrhea, headaches, muscle spasms or trouble sleeping, go see a doctor.