Acne is multi-factorial problem, hormonal disease in most of the patients, diet, exercise, hygiene, grooming practices play important role.so visiting dermatologist and taking treatment is one option and maintain treatment for long time because if you are getting any improvement with the treatment then continue it otherwise dermatologist will change it. there are few things that has to be taken care. One thing not to apply hair oil, avoid having dandruff or use anti-dandruff shampoos weekly on the scalp, using face washes that have salicylic acid or glycolic acid. Avoid using thick greasy moisturizers or cream on the face. Use only creams that are gel based or water based. Drink plenty of water, avoid fat or cheesy diet, exercise 10-15 mins of the day. Topical steroids have to be avoided. Topical antibiotics like Clindamycin are useful. Oral Antibiotics or retinoids are advised. 

It seems like you’ve done a good job taking care of the metal puncture wound by cleaning and sterilizing it. Because you had a tetanus injection in the past year, you are likely to be immune to tetanus. However, watch for redness, swelling, heat, or pain in the area. If any of these symptoms occur, seek medical attention. 

It is crucial if you have a rash on your penis to consult a dermatologist or a doctor who specializes in the urinary tract as soon as possible. It might turn out to be an ingrown hair but you might be prone to a sexually transmitted disease.

The boil-like structure could be a symptom of an infection. Pain and irritation while urinating are the most frequent. These include antibiotics or antifungal creams to help with the infection. The area should be kept clean and dry for a quicker recovery process. Drink lots of water and do not use strong soaps on the wound.