Yesterday my 13 week olds leg and foot went really red from the knee down, she was in a front carrier at the time so I thought her leg must have been pinched, but didnt seem to be the case.  When I brought her home and took her out of the carrier her leg was then covered with purple spots.   We went to the ER as we thought it may have been a petechial rash, but she did not have a fever, and blood and urine cane back fine.  So no clear diagnosis.
Welcome to the ChatDoctorIn my opinion your child seems to have had an allergic episode. It could be due to any aeroallergen, New formula feeds, insect bites or contact object. Since it has subsided at present, so no treatment is required. But in case it recurs, take the following measures to alleviate it:1. Give her promethazine or Chlorpheniramine Chat Doctor.  2. You can apply calamine lotion over the lesions. It helps as antiparasitic and comfort the child.3. Try to identify allergens in her surroundings. If it worsens, you may start steroids or a