Hi and thanks for the query,
Its worth doing a proper evaluation of these lesions, and establishing whether there is any relationship between the skin lesions and the urinary symptoms. A clinical evaluation by your pediatrician
should be sufficient in gaining enough inside into the cause of the skin manifestations. A urinary analysis and culture, with sensitivity tests are quite appropriate to diagnose and treat a possible urinary tract infection
in this case. Consulting your pediatrician for a proper clinical evaluation and management is my advice. Hope this helps you and wishing the baby the best of health.
thanks and best regards,