Hi Dear, Understanding your concern. As per your query you have rashes on legs which is very common as dirt and moisture get trapped by your clothing and the friction that comes from sitting can cause pimple. Need not to worry. I would suggest you to keep this area clean and dry , apply cream containing azelaic acid , apply warm compresses with soaked towel and apply vitamin C serum at night. If condition doesn t get better then consult dermatologist for proper examination. Doctor will examine physically along with blood test and sample for lab test . Doctor may prescribe immunosuppressants , antibiotics like clindamycin , anti inflammatory ointments. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari