Hello.. It seems that you have got tanned.. Well you can use home remedies like curd,besan- gram flour with those water, honey,aloe vera..gradually your tan will reduce..apart from this you need to ensure that you cover up yourself when you go out... Apply sunscreen of minimum 30 SPF just before going out...you can also use commercially available de tanning creams but you need to careful about selecting them..its better you ask in good parlour about it