Why do I have itching in scrotal sac?

For this type of condition, one should consult a dermatologist. The rash may involve several causes, which include allergic reactions and skin infections. In case you have already had STI testing and treatment, the rash should be diagnosed by a specialist.

Itchy skin can cause these marks when scratched frequently irritating the area. To help them heal faster, try not to scratch them more; instead use mild lotions such as aloe vera. Additionally, ensure that the affected region is kept clean and dry always;  however, with time they will go away automatically if it takes long without any changes make a point of visiting a doctor for further assistance though you need to be patient since the healing process may vary from one person to another.

Based on your symptoms, it may be an infection. Seek medical attention

Yes, cysts and papules can be treated with various treatments such as  antibiotics, topical creams, laser treatments and surgery.  I advise you to consult a qualified doctor. Based on proper assessment of your problem, he may be able to suggest the most appropriate treatment for your pimples. 

The salicylic and glycolic acid facewash cle­ared pimples at first, but they re­turned later. These­ acids sometimes dry out the skin too much. This causes more­ oil production, leading to pimples again. Instead, use­ a gentle, moisturizing face wash. Be­ sure to moisturize properly. This ke­eps skin balanced, hydrated, and pre­vents more pimple proble­ms.

It is really important to keep monitoring and watching any changes occurring in your body. These small pink pimples that you see might be due to Herpes. Having sores, blisters, and itching are the common outcomes when you get an infection. A virus caused by herpes simplex is spread by the transmission of proteins from the infected source to the recipient's body. But the only certain way till the moment it is still unconfirmed is to get tested by a professional health worker.