Hi Dear, Understanding your concern. As per your query you have symptoms of rashes on the neck which seems to be due to allergic reaction due to excessive chemical spray. Need not to worry. I would suggest you to keep this area clean and dry and apply warm compresses with soaked towel and apply vitamin C serum at night. You should avoid touching or pricking rashes. If condition doesn t get better then consult dermatologist for proper examination and may prescribe immunosuppressants , antibiotics like clindamycin , anti inflammatory medication as well. Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari