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You can wait till the dark skin changes to new pink skin in a week or so. You can apply mild glycerine fluid on your lips. Avoid sun exposure. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Since you have allergy
drugs you will also be allergic to Acetazolamide
a diurteic and anti-glaucoma
drug, some types of burns cream as well. You need to wear a medical bracelet demonstrating this condition and inform all healthcare providers to avoid life threatening reaction.