Hello, 
Thanks for your query.
Acne and 
pimples are caused due to 
hormonal imbalances. Get your blood examined, if results are not normal, you may need a hormonal therapy. If the reports are normal, change your lifestyle. 
1. Take plenty of water (1-2 l/day) 
2. Avoid oily. spicy. junk food 
3. Take care of your hygiene and sanitation 
4. Take bath/shower 1-2 times a day. 
5. Include fresh, fruits, veggies, berries, curd in your diet 
6. Doxycycline (100mg) capsules after clinical examination and consultation with a doctor can be helpful. 
7. You can apply a thin layer of 
ointments betnovate at the black spots at bed time, wash off in the early morning. 
8. Avoid getting sun-tanned 
9. Apply ripe papaya face mask, it will help to remove dark spots naturally 
10. Avoid using chemical cosmetic products on your face. 
I do hope that you have found something helpful and I will be glad to answer any further query.
Take care