As you have recently suffered from contact dermatitis (Which means allergic reaction) which has settled with hydrocortisone(Anti-allergic) cream, I will suggest to you that dont try to apply any more chemical based medications to remove the brown spots as another episode of allergic reaction to these recently recovered areas will worsen the discoloration. These spots will eventually fade away naturally in few weeks time. Avoid direct sun exposure to these areas and massage these areas with virgin olive oil(Virgin olive oil is free of harmful chemical additives) to prevent the skin from dryness and scratching. Dr.Rajesh MS,M.Ch,FRCS Cosmetic & Plastic surgeon