I see the picture, but I can't see it clearly. It should be coffee or something. Either upload a clear photo, or take your child to the dermatology or plastic surgery department of the largest local hospital for diagnosis.

Dr. Zhang Wenxian solemnly reminded me that I couldn't fully understand the illness because I couldn't see the patient face to face. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )

Hebei Children's Hospital Zhang Wenxian/