Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have symptoms of brown rash along the abdomen which seems to be due to contact dermatitis . Well there can be many reasons for symptoms you mention in query like swollen lymph nodes, allergic reaction , psoriasis , skin infection , sun allergy or fungal infection. The symptoms can also occur due to food allergy , so avoid nuts and sea food .I would suggest you to keep your skin clean and dry and protect it from sun. Apply only petroleum jelly and take antihistamine like benadryl twice a day. If condition doesn t get well then consult dermatologist for proper examination . Also apply ice pack on rashes to reduce itchiness and redness . Doctor may prescribe immunosuppressants along with anti inflammatory and corticosteroid ointment. Doctor may order certain test like skin patch test , blood test , allergy test and take history to rule out the side effects of certain drug . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari