There are many reasons why your skin would turn dark. Sun tan, overweight, pigmentation disorders like acanthosis or melasma, nutritional deficiency etc are some conditions. Unless someone examines you, we cannot know the cause. Unless we find out the cause it is difficult and pointless to treat. Please send photos with detailed history in private chat for proper treatment. Use a good sunscreen and start exercising. Take lots of fruits and green vegetables in your diet. Acne can be treated easily with facewash, tablets and creams. Some people have more oilyness on the face which results in breakouts. After completing treatment for controlling the active breakouts, tablets can be stopped and creams need to be continued to prevent recurrence. Diet and lifestyle modifications are also important. Please don't do any self treatment such as over the counter Steroid creams. Don't burst the pimples with your fingers as it can result in ugly scars. Please send your photos through private chat option for details prescription and diet advice. ,