All the above blood investigation are required to hep us conclude the cause of Acne. 

According to which the doctor can plan the necessary treatment needed. 

The above slide gives us an overview of the treatment available for acne , tropical application can be in the form of gel or cream which your doctor can advise you for application in the morning of night. Tropical application are also available in the form of serum  eg : Azelaic acid , Niacinamide , Salicylic acid etc. as these are acids it is best advice to not use it at home , but rather ask your Dermatologist for it. 

For an Acne prone skin you should use products that are light weight , gel base or liquid base. 

the order in which you can use the products are Facewash - gel base , Serum , Moisturizer - gel or liquid base , Sunscreen is a must can opt for gel or liquid base.