<s>[INST] My son went to the er with a rash that began on his inner thighs and elbows. It was in the shape of horsehoes allover. It spread to his hands, back, stomach, and feet. It was slightly itchy, but not bothersome. No fever or anything exceot his hands were swollen and his arms were numb. They have no clue what it is and I can t find anything like it online.... [/INST] Hi, It may be ringworm infection most probably. It is also called dermatophytes or Tina corporal, Tina courts, Tina minus according to the site involved. It is highly infectious or contagious skin disease. Consult the dermatologist for the perfect diagnosis and proper treatment. Antifungal like cap itraconazole with antihistamines like cetirizine. Apply Antifungal cream like ketoconazole or fluconazole cream on affected areas. Avoid soap bath. Detail liquid may be used for bath. Wash the clothes in hot water to prevent the further spread.  Hope I have answered your query. Let me know if I can assist you further.  </s>