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I recommend that you see a dermatologist for this issue. The scar tissue that resulted from the surgery might have injured the hair follicles, thus depriving them of any regrowth. Unfortunately, there is no scientifically based treatment to re-grow hair in scar tissue except by means of a transplant. Some topical treatments may be prescribed by a dermatologist

It’s common to get gray hair early, especially if it started in your teenage years. This can be due to genetics, stress, or diet. While it might seem worrying, gray hair usually isn't a sign of a serious health problem. You can choose to use hair dye or embrace your natural look. Remember to eat a balanced diet, manage stress, and take good care of your hair.

Before­ putting a needle in your body, disinfe­cting the skin area is crucial. It preve­nts germs from entering, which could cause­ infections. Signs of infection may include re­dness, swelling, pain, and feve­r. So, always clean the skin first when ge­tting an injection. Using surgical spirit kills germs on the surface­. 

The sexually transmitted infection, human papillomavirus causes genital warts. Although certain individuals can be born with a genetic inclination to get warts, it is usually found through sexual intercourse. Genital warts must be diagnosed and treated by a dermatologist or the specialist in STDs to do it properly.

You are afraid of Stevens-Johnson Syndrome from drugs. It is a rare but serious skin reaction. Symptoms can be flu-like symptoms, a rash, and blisters on the skin. Medicines or infections can cause it. Before starting any new medicine, speak with your doctor if this is something that concerns you. They will be able to help you choose what might work best for you and watch out for signs of trouble.